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

tools/clang/blink_gc_plugin/tests/class_requires_finalization_base.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 CLASS_REQUIRES_FINALIZATION_BASE_H_
 #define CLASS_REQUIRES_FINALIZATION_BASE_H_
 
 #include "heap/stubs.h"
 
 namespace blink {
 
 class A : public GarbageCollected<A> {
 public:
-    virtual void trace(Visitor*) {}
+    virtual void Trace(Visitor*) {}
 };
 
 class B {
 public:
     ~B() { /* user-declared, thus, non-trivial */ }
 };
 
 // Second base class needs finalization.
 class NeedsFinalizer : public A, public B {
 public:
-    void trace(Visitor*);
+    void Trace(Visitor*);
 };
 
 // Base does not need finalization.
 class DoesNotNeedFinalizer : public A {
 public:
-    void trace(Visitor*);
+    void Trace(Visitor*);
 };
 
 }
 
 #endif