Unify and provide one IsGarbageCollectedType<T> implementation.

third_party/WebKit/Source/platform/CrossThreadCopier.h

 /*
  * Copyright (C) 2009, 2010 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 235 matching lines @@
 template <typename T>
 struct CrossThreadCopier<AllowCrossThreadAccessWrapper<T>> {
     STATIC_ONLY(CrossThreadCopier);
     typedef T Type;
     static Type copy(const AllowCrossThreadAccessWrapper<T>& wrapper) { return wrapper.value(); }
 };
 
 template <typename T>
 AllowCrossThreadAccessWrapper<T*> AllowCrossThreadAccess(T* value)
 {
-    static_assert(!blink::IsGarbageCollectedType<T>::value, "Use wrapCrossThreadPersistent() instead for garbage-collected pointers");
+    static_assert(!IsGarbageCollectedType<T>::value, "Use wrapCrossThreadPersistent() instead for garbage-collected pointers");
     static_assert(!WTF::IsSubclassOfTemplate<T, ThreadSafeRefCounted>::value, "Use PassRefPtr<T> instead for ThreadSafeRefCounted");
     return AllowCrossThreadAccessWrapper<T*>(value);
 }
 
 } // namespace blink
 
 #endif // CrossThreadCopier_h