clang/blink_gc_plugin: Replace 'WebCore' with 'blink'

tools/clang/blink_gc_plugin/tests/trace_collections.h

 // Copyright 2014 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 TRACE_COLLECTIONS_H_
 #define TRACE_COLLECTIONS_H_
 
 #include "heap/stubs.h"
 
-namespace WebCore {
+namespace blink {
 
 class HeapObject : public GarbageCollected<HeapObject> {
 public:
     void trace(Visitor*);
 private:
     HeapVector<Member<HeapObject> > m_heapVector;
     Vector<Member<HeapObject>, 0, HeapAllocator> m_wtfVector;
 
     HeapDeque<Member<HeapObject> > m_heapDeque;
     Deque<Member<HeapObject>, 0, HeapAllocator> m_wtfDeque;
@@ skipping 14 matching lines @@
     HeapHashMap<Member<HeapObject>, int > m_heapMapVal;
     HashMap<int, Member<HeapObject>, void, void, void, HeapAllocator>
     m_wtfMapKey;
     HashMap<Member<HeapObject>, int, void, void, void, HeapAllocator>
     m_wtfMapVal;
 };
 
 }
 
 #endif