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

tools/clang/blink_gc_plugin/tests/cycle_sub.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 CYCLE_SUB_H_
 #define CYCLE_SUB_H_
 
 #include "heap/stubs.h"
 
-namespace WebCore {
+namespace blink {
 
 class C;
 
 // This contains a leaking cycle:
 // C -per-> A -sub-> B -ref-> C
 
 class A : public GarbageCollectedFinalized<A> {
 public:
     virtual void trace(Visitor*) {}
 };
 
 class B : public A {
 public:
     virtual void trace(Visitor*);
 private:
     RefPtr<C> m_c;
 };
 
 class C : public RefCounted<C> {
 private:
     Persistent<A> m_a;
 };
 
 }
 
 #endif