Add use-chromium-style-naming option to Blink GC plugin.

tools/clang/blink_gc_plugin/tests/legacy_naming/persistent_no_trace.h

 // Copyright 2016 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 PERSISTENT_NO_TRACE_H_
 #define PERSISTENT_NO_TRACE_H_
 
 #include "heap/stubs.h"
 
 namespace blink {
 
 class HeapObject : public GarbageCollected<HeapObject> {
 public:
     void trace(Visitor*);
 private:
     CrossThreadPersistent<HeapObject> m_crossThreadPersistent;
     CrossThreadWeakPersistent<HeapObject> m_crossThreadWeakPersistent;
 };
 
 }
 
 #endif