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

third_party/WebKit/Source/wtf/Functional.h

 /*
  * Copyright (C) 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 17 matching lines @@
 
 #include "base/bind.h"
 #include "base/threading/thread_checker.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/RefPtr.h"
 #include "wtf/ThreadSafeRefCounted.h"
 #include "wtf/TypeTraits.h"
+#include "wtf/WeakPtr.h"
 #include <utility>
 
 namespace blink {
 template <typename T> class Member;
 template <typename T> class WeakMember;
 }
 
 namespace WTF {
 
 // Functional.h provides a very simple way to bind a function pointer and arguments together into a function object
@@ skipping 183 matching lines @@
 }
 
 typedef Function<void(), SameThreadAffinity> Closure;
 typedef Function<void(), CrossThreadAffinity> CrossThreadClosure;
 
 } // namespace WTF
 
 namespace base {
 
 template <typename T>
+struct IsWeakReceiver<WTF::WeakPtr<T>> : std::true_type {};
+
+template <typename T>
 struct BindUnwrapTraits<WTF::RefPtr<T>> {
     static T* Unwrap(const WTF::RefPtr<T>& wrapped)
     {
         return wrapped.get();
     }
 };
 
 template <typename T>
 struct BindUnwrapTraits<WTF::PassedWrapper<T>> {
     static T Unwrap(const WTF::PassedWrapper<T>& wrapped)
@@ skipping 13 matching lines @@
 } // namespace base
 
 using WTF::passed;
 using WTF::unretained;
 using WTF::crossThreadUnretained;
 
 using WTF::Function;
 using WTF::CrossThreadClosure;
 
 #endif // WTF_Functional_h