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

tools/clang/blink_gc_plugin/tests/class_requires_finalization_field.cpp

 // 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.
 
 #include "class_requires_finalization_field.h"
 
-namespace WebCore {
+namespace blink {
 
 void NeedsFinalizer::trace(Visitor* visitor)
 {
     visitor->trace(m_as);
     A::trace(visitor);
 }
 
 void AlsoNeedsFinalizer::trace(Visitor* visitor)
 {
     visitor->trace(m_bs);
     A::trace(visitor);
 }
 
 void DoesNotNeedFinalizer::trace(Visitor* visitor)
 {
     visitor->trace(m_bs);
     A::trace(visitor);
 }
 
 void AlsoDoesNotNeedFinalizer::trace(Visitor* visitor)
 {
     visitor->trace(m_as);
     visitor->trace(m_cs);
     A::trace(visitor);
 }
 
 }