Use #pragma once in inspector headers
https://bugs.webkit.org/show_bug.cgi?id=160861

Patch by Joseph Pecoraro <pecoraro@apple.com> on 2016-08-15
Reviewed by Mark Lam.

* inspector/*.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@204479 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/Source/WebCore/inspector/InspectorClient.h b/Source/WebCore/inspector/InspectorClient.h
index adda136..f1fa9b8 100644
--- a/Source/WebCore/inspector/InspectorClient.h
+++ b/Source/WebCore/inspector/InspectorClient.h
@@ -24,8 +24,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef InspectorClient_h
-#define InspectorClient_h
+#pragma once
 
 #include <wtf/Forward.h>
 
@@ -68,5 +67,3 @@
 };
 
 } // namespace WebCore
-
-#endif // !defined(InspectorClient_h)