Cheaper thread-safe atomic initialization of static references.

Source/platform/blob/BlobRegistry.cpp

Index: Source/platform/blob/BlobRegistry.cpp
diff --git a/Source/platform/blob/BlobRegistry.cpp b/Source/platform/blob/BlobRegistry.cpp
index cba341c796a1782f1025df1ac005699c373a9b63..a7b0678911bc64b1f251a5d2c24dd8520b7d2273 100644
--- a/Source/platform/blob/BlobRegistry.cpp
+++ b/Source/platform/blob/BlobRegistry.cpp
@@ -105,11 +105,11 @@ typedef HashMap<String, RefPtr<SecurityOrigin>> BlobURLOriginMap;
 static ThreadSpecific<BlobURLOriginMap>& originMap()
 {
     // We want to create the BlobOriginCache exactly once because it is shared by all the threads.
-    AtomicallyInitializedStatic(BlobOriginCache*, cache = new BlobOriginCache);
+    AtomicallyInitializedStaticReference(BlobOriginCache, cache, new BlobOriginCache);
     (void)cache; // BlobOriginCache's constructor does the interesting work.
 
-    AtomicallyInitializedStatic(ThreadSpecific<BlobURLOriginMap>*, map = new ThreadSpecific<BlobURLOriginMap>);
-    return *map;
+    AtomicallyInitializedStaticReference(ThreadSpecific<BlobURLOriginMap>, map, new ThreadSpecific<BlobURLOriginMap>);
+    return map;
 }
 
 static void saveToOriginMap(SecurityOrigin* origin, const KURL& url)