Cheaper thread-safe atomic initialization of static references.

Source/modules/webdatabase/DatabaseTracker.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 41 matching lines @@
 {
     if (Platform::current()->databaseObserver()) {
         Platform::current()->databaseObserver()->databaseClosed(
             createDatabaseIdentifierFromSecurityOrigin(database->securityOrigin()),
             database->stringIdentifier());
     }
 }
 
 DatabaseTracker& DatabaseTracker::tracker()
 {
-    AtomicallyInitializedStatic(DatabaseTracker&, tracker = *new DatabaseTracker());
+    AtomicallyInitializedStaticReference(DatabaseTracker, tracker, new DatabaseTracker);
     return tracker;
 }
 
 DatabaseTracker::DatabaseTracker()
 {
     SQLiteFileSystem::registerSQLiteVFS();
 }
 
 bool DatabaseTracker::canEstablishDatabase(DatabaseContext* databaseContext, const String& name, const String& displayName, unsigned long estimatedSize, DatabaseError& error)
 {
@@ skipping 188 matching lines @@
         DatabaseSet::iterator found = databaseSet->find(database);
         if (found == databaseSet->end())
             return;
     }
 
     // And we have to call closeImmediately() without our collection lock being held.
     database->closeImmediately();
 }
 
 } // namespace blink