Add a unified resource tracker shared between the proxy and the impl.

webkit/plugins/ppapi/ppb_scrollbar_impl.h

 // Copyright (c) 2011 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 WEBKIT_PLUGINS_PPAPI_PPB_SCROLLBAR_IMPL_H_
 #define WEBKIT_PLUGINS_PPAPI_PPB_SCROLLBAR_IMPL_H_
 
 #include <vector>
 
 #include "base/task.h"
@@ skipping 10 matching lines @@
 
 class PPB_Scrollbar_Impl : public PPB_Widget_Impl,
                            public ::ppapi::thunk::PPB_Scrollbar_API,
                            public WebKit::WebScrollbarClient {
  public:
   static PP_Resource Create(PluginInstance* instance,
                             bool vertical);
 
   virtual ~PPB_Scrollbar_Impl();
 
-  // ResourceObjectBase override.
+  // Resource override.
   virtual PPB_Scrollbar_API* AsPPB_Scrollbar_API() OVERRIDE;
 
   // Returns a pointer to the interface implementing PPB_Scrollbar_0_3 that is
   // exposed to the plugin. New code should use the thunk system for the new
   // version of this API.
   static const PPB_Scrollbar_0_3_Dev* Get0_3Interface();
 
   // Returns a pointer to the interface implementing PPB_Scrollbar_0_4 that is
   // exposed to the plugin. New code should use the thunk system for the new
   // version of this API.
@@ skipping 37 matching lines @@
   // Used so that the post task for Invalidate doesn't keep an extra reference.
   ScopedRunnableMethodFactory<PPB_Scrollbar_Impl> method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Scrollbar_Impl);
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_PPB_SCROLLBAR_IMPL_H_