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

tools/clang/blink_gc_plugin/tests/legacy_naming/left_most_gc_base.cpp

Index: tools/clang/blink_gc_plugin/tests/legacy_naming/left_most_gc_base.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/trace_collections.cpp b/tools/clang/blink_gc_plugin/tests/legacy_naming/left_most_gc_base.cpp
similarity index 63%
copy from tools/clang/blink_gc_plugin/tests/trace_collections.cpp
copy to tools/clang/blink_gc_plugin/tests/legacy_naming/left_most_gc_base.cpp
index 9ba7c9604f918a2e547b0873e5a2512bbc663ce9..041d9f0700b27049e008266014f1915a48982212 100644
--- a/tools/clang/blink_gc_plugin/tests/trace_collections.cpp
+++ b/tools/clang/blink_gc_plugin/tests/legacy_naming/left_most_gc_base.cpp
@@ -2,12 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "trace_collections.h"
+#include "left_most_gc_base.h"
 
-namespace blink {
-
-void HeapObject::trace(Visitor* visitor)
-{
-}
-
-}
+// Nothing to define.