Change mojo JS bindings to expose a handle object, which is Closed when garbage

gin/test/gc.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 MOJO_BINDINGS_JS_CORE_H_
-#define MOJO_BINDINGS_JS_CORE_H_
+#ifndef GIN_TEST_GC_H_
+#define GIN_TEST_GC_H_
 
 #include "v8/include/v8.h"
 
-namespace mojo {
-namespace js {
+namespace gin {
 
-class Core {
+// This module provides bindings to the garbage collector.
+class GC {
  public:
   static const char kModuleName[];
   static v8::Local<v8::Value> GetModule(v8::Isolate* isolate);
 };
 
-}  // namespace js
-}  // namespace mojo
+}  // namespace gin
 
-#endif  // MOJO_BINDINGS_JS_CORE_H_
+#endif  // GIN_TEST_GC_H_