Convert more interfaces to the new thunk system. This goes up to and including

ppapi/proxy/plugin_resource_tracker.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 PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_
 #define PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_
 
 #include <map>
 #include <utility>
 
+#include "base/compiler_specific.h"
 #include "base/memory/linked_ptr.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/proxy/host_resource.h"
 #include "ppapi/shared_impl/tracker_base.h"
 
 template<typename T> struct DefaultSingletonTraits;
@@ skipping 28 matching lines @@
   void AddRefResource(PP_Resource resource);
   void ReleaseResource(PP_Resource resource);
 
   // Given a host resource, maps it to an existing plugin resource ID if it
   // exists, or returns 0 on failure.
   PP_Resource PluginResourceForHostResource(
       const HostResource& resource) const;
 
   // TrackerBase.
   virtual ::ppapi::ResourceObjectBase* GetResourceAPI(
-      PP_Resource res);
+      PP_Resource res) OVERRIDE;
   virtual ::ppapi::FunctionGroupBase* GetFunctionAPI(
       PP_Instance inst,
-      pp::proxy::InterfaceID id);
+      pp::proxy::InterfaceID id) OVERRIDE;
+  virtual PP_Instance GetInstanceForResource(PP_Resource resource) OVERRIDE;
 
  private:
   friend struct DefaultSingletonTraits<PluginResourceTracker>;
   friend class PluginResourceTrackerTest;
   friend class PluginProxyTest;
 
   PluginResourceTracker();
   ~PluginResourceTracker();
 
   struct ResourceInfo {
@@ skipping 23 matching lines @@
   // duplicates.
   PP_Resource last_resource_id_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginResourceTracker);
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_