diff --git a/Source/WebCore/PAL/ChangeLog b/Source/WebCore/PAL/ChangeLog
index f22c436..8e11393 100644
--- a/Source/WebCore/PAL/ChangeLog
+++ b/Source/WebCore/PAL/ChangeLog
@@ -1,3 +1,16 @@
+2020-04-02  Per Arne Vollan  <pvollan@apple.com>
+
+        [macOS] Remove redundant call to check in with Launch Services
+        https://bugs.webkit.org/show_bug.cgi?id=209911
+
+        Reviewed by Darin Adler.
+
+        Move declarations to SPI header files.
+
+        * PAL.xcodeproj/project.pbxproj:
+        * pal/spi/cocoa/CoreServicesSPI.h: Added.
+        * pal/spi/cocoa/LaunchServicesSPI.h:
+
 2020-04-02  Eric Carlson  <eric.carlson@apple.com>
 
         [iOS] Allow WebKit to use camera in multi-tasking mode
diff --git a/Source/WebCore/PAL/PAL.xcodeproj/project.pbxproj b/Source/WebCore/PAL/PAL.xcodeproj/project.pbxproj
index 56d0790..bfe3917 100644
--- a/Source/WebCore/PAL/PAL.xcodeproj/project.pbxproj
+++ b/Source/WebCore/PAL/PAL.xcodeproj/project.pbxproj
@@ -345,6 +345,7 @@
 		A3C66CDA1F462D6A009E6EE9 /* SessionID.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = SessionID.cpp; sourceTree = "<group>"; };
 		A3C66CDB1F462D6A009E6EE9 /* SessionID.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SessionID.h; sourceTree = "<group>"; };
 		C037494124127CCB00D9A36E /* AccessibilitySupportSPI.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AccessibilitySupportSPI.h; sourceTree = "<group>"; };
+		C138EA1A2436447200656DF1 /* CoreServicesSPI.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = CoreServicesSPI.h; sourceTree = "<group>"; };
 		C15CBB3223F34A1200300CC7 /* NSUserDefaultsSPI.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = NSUserDefaultsSPI.h; sourceTree = "<group>"; };
 		C2147A4A1EFD0AA600056FA5 /* CopyPALHeaders.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; path = CopyPALHeaders.xcconfig; sourceTree = "<group>"; };
 		CDACB35E23873E480018D7CE /* MediaToolboxSoftLink.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = MediaToolboxSoftLink.cpp; sourceTree = "<group>"; };
@@ -427,6 +428,7 @@
 				0C2DA1221F3BEB4900DBC317 /* AVKitSPI.h */,
 				0C2DA1231F3BEB4900DBC317 /* CFNSURLConnectionSPI.h */,
 				7A36D0F8223AD9AB00B0522E /* CommonCryptoSPI.h */,
+				C138EA1A2436447200656DF1 /* CoreServicesSPI.h */,
 				0C2DA1241F3BEB4900DBC317 /* CoreTextSPI.h */,
 				0C2DA1251F3BEB4900DBC317 /* DataDetectorsCoreSPI.h */,
 				1D12CC4A2411BCAE00FDA0A3 /* FeatureFlagsSPI.h */,
diff --git a/Source/WebCore/PAL/pal/spi/cocoa/CoreServicesSPI.h b/Source/WebCore/PAL/pal/spi/cocoa/CoreServicesSPI.h
new file mode 100644
index 0000000..0c4c8dd
--- /dev/null
+++ b/Source/WebCore/PAL/pal/spi/cocoa/CoreServicesSPI.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2020 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if USE(APPLE_INTERNAL_SDK)
+
+#include <CarbonCore/RuntimePriv.h>
+
+#endif
+
+extern "C" void _CSCheckFixDisable();
diff --git a/Source/WebCore/PAL/pal/spi/cocoa/LaunchServicesSPI.h b/Source/WebCore/PAL/pal/spi/cocoa/LaunchServicesSPI.h
index 2ad0197..5b5bced 100644
--- a/Source/WebCore/PAL/pal/spi/cocoa/LaunchServicesSPI.h
+++ b/Source/WebCore/PAL/pal/spi/cocoa/LaunchServicesSPI.h
@@ -31,6 +31,7 @@
 
 #if PLATFORM(MAC)
 #import <CoreServices/CoreServicesPriv.h>
+#import <LaunchServices/LSApplicationServicesPriv.h>
 #elif PLATFORM(IOS_FAMILY)
 #import <MobileCoreServices/LSAppLinkPriv.h>
 #elif PLATFORM(IOS)
@@ -103,6 +104,10 @@
 
 OSStatus _RegisterApplication(CFDictionaryRef, ProcessSerialNumber*);
 
+typedef bool (^LSServerConnectionAllowedBlock) (CFDictionaryRef optionsRef);
+extern "C" void _LSSetApplicationLaunchServicesServerConnectionStatus(uint64_t flags, LSServerConnectionAllowedBlock block);
+extern "C" CFDictionaryRef _LSApplicationCheckIn(LSSessionID sessionID, CFDictionaryRef applicationInfo);
+
 WTF_EXTERN_C_END
 
 #endif // PLATFORM(MAC)
diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
index 80d21b6..5fc3d0f 100644
--- a/Source/WebKit/ChangeLog
+++ b/Source/WebKit/ChangeLog
@@ -1,3 +1,21 @@
+2020-04-02  Per Arne Vollan  <pvollan@apple.com>
+
+        [macOS] Remove redundant call to check in with Launch Services
+        https://bugs.webkit.org/show_bug.cgi?id=209911
+
+        Reviewed by Darin Adler.
+
+        There is no need to explicitly check in with Launch Services or call RegisterApplication in the WebContent process,
+        since this is handled when calling [NSApplication _accessibilityInitialize].
+
+        No new tests, since this only removes a redundant call, and should be covered by existing tests.
+
+        * Shared/mac/AuxiliaryProcessMac.mm:
+        * WebProcess/cocoa/WebProcessCocoa.mm:
+        (WebKit::WebProcess::platformInitializeWebProcess):
+        (WebKit::WebProcess::updateProcessName):
+        (WebKit::WebProcess::platformInitializeProcess):
+
 2020-04-02  Alex Christensen  <achristensen@webkit.org>
 
         Add SPI to restrict loading to main resources or non-network loads
diff --git a/Source/WebKit/Shared/mac/AuxiliaryProcessMac.mm b/Source/WebKit/Shared/mac/AuxiliaryProcessMac.mm
index 6010a95..90f03a5 100644
--- a/Source/WebKit/Shared/mac/AuxiliaryProcessMac.mm
+++ b/Source/WebKit/Shared/mac/AuxiliaryProcessMac.mm
@@ -41,6 +41,7 @@
 #import <mach/mach.h>
 #import <mach/task.h>
 #import <pal/crypto/CryptoDigest.h>
+#import <pal/spi/cocoa/CoreServicesSPI.h>
 #import <pal/spi/cocoa/LaunchServicesSPI.h>
 #import <pwd.h>
 #import <stdlib.h>
@@ -72,13 +73,6 @@
 };
 #endif
 
-typedef bool (^LSServerConnectionAllowedBlock) ( CFDictionaryRef optionsRef );
-extern "C" void _LSSetApplicationLaunchServicesServerConnectionStatus(uint64_t flags, LSServerConnectionAllowedBlock block);
-extern "C" CFDictionaryRef _LSApplicationCheckIn(LSSessionID sessionID, CFDictionaryRef applicationInfo);
-#if HAVE(CSCHECKFIXDISABLE)
-extern "C" void _CSCheckFixDisable();
-#endif
-
 namespace WebKit {
 using namespace WebCore;
 
diff --git a/Source/WebKit/WebProcess/cocoa/WebProcessCocoa.mm b/Source/WebKit/WebProcess/cocoa/WebProcessCocoa.mm
index f22c025..4208b99 100644
--- a/Source/WebKit/WebProcess/cocoa/WebProcessCocoa.mm
+++ b/Source/WebKit/WebProcess/cocoa/WebProcessCocoa.mm
@@ -77,6 +77,7 @@
 #import <pal/spi/cf/CFNetworkSPI.h>
 #import <pal/spi/cf/CFUtilitiesSPI.h>
 #import <pal/spi/cg/CoreGraphicsSPI.h>
+#import <pal/spi/cocoa/CoreServicesSPI.h>
 #import <pal/spi/cocoa/LaunchServicesSPI.h>
 #import <pal/spi/cocoa/NSAccessibilitySPI.h>
 #import <pal/spi/cocoa/QuartzCoreSPI.h>
@@ -230,6 +231,8 @@
 #if PLATFORM(MAC) && ENABLE(WEBPROCESS_NSRUNLOOP)
     // Need to initialize accessibility for VoiceOver to work when the WebContent process is using NSRunLoop.
     // Currently, it is also needed to allocate and initialize an NSApplication object.
+    // This method call will also call RegisterApplication, so there is no need for us to call this or
+    // check in with Launch Services
     [NSApplication _accessibilityInitialize];
 #endif
 
@@ -274,7 +277,6 @@
         SandboxExtension::consumePermanently(parameters.dynamicMachExtensionHandles[i]);
 #endif
     
-#if PLATFORM(COCOA)
     if (parameters.neHelperExtensionHandle)
         SandboxExtension::consumePermanently(*parameters.neHelperExtensionHandle);
     if (parameters.neSessionManagerExtensionHandle)
@@ -285,18 +287,15 @@
 
     if (parameters.mimeTypesMap)
         overriddenMimeTypesMap() = WTFMove(parameters.mimeTypesMap);
-#endif
 
 #if PLATFORM(IOS_FAMILY)
     RenderThemeIOS::setCSSValueToSystemColorMap(WTFMove(parameters.cssValueToSystemColorMap));
     RenderThemeIOS::setFocusRingColor(parameters.focusRingColor);
 #endif
 
-#if PLATFORM(COCOA)
     // FIXME(207716): The following should be removed when the GPU process is complete.
     for (size_t i = 0, size = parameters.mediaExtensionHandles.size(); i < size; ++i)
         SandboxExtension::consumePermanently(parameters.mediaExtensionHandles[i]);
-#endif
 
 #if ENABLE(CFPREFS_DIRECT_MODE)
     if (parameters.preferencesExtensionHandle) {
@@ -345,14 +344,6 @@
 void WebProcess::updateProcessName()
 {
 #if PLATFORM(MAC)
-    static std::once_flag onceFlag;
-    std::call_once(
-        onceFlag,
-        [this] {
-            // Checking in with Launch Services is necessary to be able to set the process' display name.
-            launchServicesCheckIn();
-    });
-
     NSString *applicationName;
     switch (m_processType) {
     case ProcessType::Inspector:
@@ -546,6 +537,12 @@
 #if HAVE(APP_SSO)
     [NSURLSession _disableAppSSO];
 #endif
+
+#if HAVE(CSCHECKFIXDISABLE)
+    // _CSCheckFixDisable() needs to be called before checking in with Launch Services. The WebContent process is checking in
+    // with Launch Services in WebProcess::platformInitializeWebProcess when calling +[NSApplication _accessibilityInitialize].
+    _CSCheckFixDisable();
+#endif
 }
 
 #if USE(APPKIT)