Implement WTF::WeakPtr in terms of base::WeakPtr

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 22 matching lines @@
 
 #include "platform/PlatformExport.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 #include "wtf/Assertions.h"
 #include "wtf/Forward.h"
 #include "wtf/Functional.h" // FunctionThreadAffinity
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/ThreadSafeRefCounted.h"
 #include "wtf/TypeTraits.h"
+#include "wtf/WeakPtr.h"
 #include <memory>
 
 class SkRefCnt;
 
 namespace WTF {
 
 template <typename T>
 class PassedWrapper;
 
 }
@@ skipping 138 matching lines @@
 template <>
 struct CrossThreadCopier<ResourceResponse> {
     STATIC_ONLY(CrossThreadCopier);
     typedef WTF::PassedWrapper<std::unique_ptr<CrossThreadResourceResponseData>> Type;
     PLATFORM_EXPORT static Type copy(const ResourceResponse&);
 };
 
 } // namespace blink
 
 #endif // CrossThreadCopier_h