Cheaper thread-safe atomic initialization of static references.

Source/core/timing/Performance.cpp

Index: Source/core/timing/Performance.cpp
diff --git a/Source/core/timing/Performance.cpp b/Source/core/timing/Performance.cpp
index b1416dd54b5172cd2d308eba83d1a2f016f2ece7..a8000fa8f17492f286b29f2f605e5a222c5f5e0e 100644
--- a/Source/core/timing/Performance.cpp
+++ b/Source/core/timing/Performance.cpp
@@ -162,7 +162,7 @@ void Performance::webkitSetResourceTimingBufferSize(unsigned size)
 
 static bool passesTimingAllowCheck(const ResourceResponse& response, Document* requestingDocument, const AtomicString& originalTimingAllowOrigin)
 {
-    AtomicallyInitializedStatic(AtomicString&, timingAllowOrigin = *new AtomicString("timing-allow-origin"));
+    AtomicallyInitializedStaticReference(AtomicString, timingAllowOrigin, new AtomicString("timing-allow-origin"));
 
     RefPtr<SecurityOrigin> resourceOrigin = SecurityOrigin::create(response.url());
     if (resourceOrigin->isSameSchemeHostPort(requestingDocument->securityOrigin()))