Clean up remaining uses of WebCore namespace

Source/platform/heap/Handle.h

 /*
  * Copyright (C) 2014 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 679 matching lines @@
     {
         visitor->trace(*t);
     }
 };
 
 template <typename T> struct RemoveHeapPointerWrapperTypes {
     typedef typename WTF::RemoveTemplate<typename WTF::RemoveTemplate<typename WTF::RemoveTemplate<T, Member>::Type, WeakMember>::Type, RawPtr>::Type Type;
 };
 
 template<typename T>
-struct TraceIfNeeded : public TraceIfEnabled<T, WebCore::IsGarbageCollectedType<typename RemoveHeapPointerWrapperTypes<typename WTF::RemovePointer<T>::Type>::Type>::value> { };
+struct TraceIfNeeded : public TraceIfEnabled<T, blink::IsGarbageCollectedType<typename RemoveHeapPointerWrapperTypes<typename WTF::RemovePointer<T>::Type>::Type>::value> { };
 
 // This trace trait for std::pair will null weak members if their referent is
 // collected. If you have a collection that contain weakness it does not remove
 // entries from the collection that contain nulled weak members.
 template<typename T, typename U>
 class TraceTrait<std::pair<T, U> > {
 public:
     static const bool firstNeedsTracing = WTF::NeedsTracing<T>::value || WTF::IsWeak<T>::value;
     static const bool secondNeedsTracing = WTF::NeedsTracing<U>::value || WTF::IsWeak<U>::value;
     static void trace(Visitor* visitor, std::pair<T, U>* pair)
@@ skipping 488 matching lines @@
 struct ParamStorageTraits<T*> : public PointerParamStorageTraits<T*, blink::IsGarbageCollectedType<T>::value> {
 };
 
 template<typename T>
 struct ParamStorageTraits<RawPtr<T> > : public PointerParamStorageTraits<T*, blink::IsGarbageCollectedType<T>::value> {
 };
 
 } // namespace WTF
 
 #endif