Refactor the way singleton-style resources are exposed via PPB_Instance

ppapi/proxy/ppb_instance_proxy.h

 // Copyright (c) 2012 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_PPB_INSTANCE_PROXY_H_
 #define PPAPI_PROXY_PPB_INSTANCE_PROXY_H_
 
 #include <string>
 
 #include "ppapi/c/pp_instance.h"
@@ skipping 52 matching lines @@
                                           int32_t total,
                                           PP_Bool final_result) OVERRIDE;
   virtual void SelectedFindResultChanged(PP_Instance instance,
                                          int32_t index) OVERRIDE;
   virtual PP_Var GetFontFamilies(PP_Instance instance) OVERRIDE;
   virtual PP_Bool SetFullscreen(PP_Instance instance,
                                 PP_Bool fullscreen) OVERRIDE;
   virtual PP_Bool GetScreenSize(PP_Instance instance,
                                 PP_Size* size) OVERRIDE;
   virtual thunk::PPB_Flash_API* GetFlashAPI() OVERRIDE;
-  virtual thunk::PPB_Flash_Functions_API* GetFlashFunctionsAPI(
-      PP_Instance instance) OVERRIDE;
-  virtual thunk::PPB_Flash_Clipboard_API* GetFlashClipboardAPI(
-      PP_Instance instance) OVERRIDE;
-  virtual thunk::PPB_Gamepad_API* GetGamepadAPI(PP_Instance instance) OVERRIDE;
+  virtual Resource* GetSingletonResource(PP_Instance instance,
+                                         SingletonResourceID id) OVERRIDE;
   virtual int32_t RequestInputEvents(PP_Instance instance,
                                      uint32_t event_classes) OVERRIDE;
   virtual int32_t RequestFilteringInputEvents(PP_Instance instance,
                                               uint32_t event_classes) OVERRIDE;
   virtual void ClearInputEventRequest(PP_Instance instance,
                                       uint32_t event_classes) OVERRIDE;
   virtual void ClosePendingUserGesture(PP_Instance instance,
                                        PP_TimeTicks timestamp) OVERRIDE;
   virtual void ZoomChanged(PP_Instance instance, double factor) OVERRIDE;
   virtual void ZoomLimitsChanged(PP_Instance instance,
@@ skipping 187 matching lines @@
   // Other helpers.
   void CancelAnyPendingRequestSurroundingText(PP_Instance instance);
 
   ProxyCompletionCallbackFactory<PPB_Instance_Proxy> callback_factory_;
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_INSTANCE_PROXY_H_