Unreviewed, rolling out r224019.

This change caused API test WebKit.MSEIsPlayingAudio to time
out.

Reverted changeset:

"XMLHttpRequest should not treat file URLs as same origin"
https://bugs.webkit.org/show_bug.cgi?id=178565
https://trac.webkit.org/changeset/224019

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@224025 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/Source/WebCore/loader/DocumentThreadableLoader.cpp b/Source/WebCore/loader/DocumentThreadableLoader.cpp
index 46e1e8f..4b48f51 100644
--- a/Source/WebCore/loader/DocumentThreadableLoader.cpp
+++ b/Source/WebCore/loader/DocumentThreadableLoader.cpp
@@ -94,7 +94,7 @@
     , m_options(options)
     , m_origin(WTFMove(origin))
     , m_referrer(WTFMove(referrer))
-    , m_sameOriginRequest(securityOrigin().requestIsSameOrigin(request))
+    , m_sameOriginRequest(securityOrigin().canRequest(request.url()))
     , m_simpleRequest(true)
     , m_async(blockingBehavior == LoadAsynchronously)
     , m_delayCallbacksForIntegrityCheck(!m_options.integrity.isEmpty())