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

tools/clang/blink_gc_plugin/tests/class_does_not_require_finalization.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_does_not_require_finalization.h"
 
 namespace blink {
 
-void DoesNotNeedFinalizer::trace(Visitor* visitor)
+void DoesNotNeedFinalizer::Trace(Visitor* visitor)
 {
 }
 
 DoesNotNeedFinalizer2::~DoesNotNeedFinalizer2()
 {
 }
 
-void DoesNotNeedFinalizer2::trace(Visitor* visitor)
+void DoesNotNeedFinalizer2::Trace(Visitor* visitor)
 {
 }
 
 
 }