Migrate Handle.h WTF decls closer to their corresponding definitions.

third_party/WebKit/Source/platform/heap/GarbageCollected.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef GarbageCollected_h
 #define GarbageCollected_h
 
 #include "platform/heap/ThreadState.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
@@ skipping 375 matching lines @@
 
     template<typename U, size_t sz = sizeof(U)> static TrueType isSizeofKnown(U*);
     static FalseType isSizeofKnown(...);
     static T& t;
 public:
     static const bool value = sizeof(TrueType) == sizeof(isSizeofKnown(&t));
 };
 
 } // namespace blink
 
+namespace WTF {
+
+// Adoption is not needed nor wanted for RefCountedGarbageCollected<>-derived types.
+template<typename T>
+PassRefPtr<T> adoptRef(blink::RefCountedGarbageCollected<T>*) = delete;
+
+} // namespace WTF
+
 #endif