Refactor the way singleton-style resources are exposed via PPB_Instance

webkit/plugins/ppapi/ppapi_plugin_instance.h

Index: webkit/plugins/ppapi/ppapi_plugin_instance.h
diff --git a/webkit/plugins/ppapi/ppapi_plugin_instance.h b/webkit/plugins/ppapi/ppapi_plugin_instance.h
index 762510a26d9eaff8628e639714ae3be390273e6e..05974093f21ad3fdcb40bf19921c389fa309b7bf 100644
--- a/webkit/plugins/ppapi/ppapi_plugin_instance.h
+++ b/webkit/plugins/ppapi/ppapi_plugin_instance.h
@@ -38,8 +38,6 @@
 #include "ppapi/c/private/ppp_instance_private.h"
 #include "ppapi/shared_impl/ppb_instance_shared.h"
 #include "ppapi/shared_impl/ppb_view_shared.h"
-#include "ppapi/thunk/ppb_flash_clipboard_api.h"
-#include "ppapi/thunk/ppb_flash_functions_api.h"
 #include "ppapi/thunk/ppb_gamepad_api.h"
 #include "ppapi/thunk/resource_creation_api.h"
 #include "ppapi/shared_impl/tracked_callback.h"
@@ -366,12 +364,8 @@ class WEBKIT_PLUGINS_EXPORT PluginInstance :
   virtual PP_Bool GetScreenSize(PP_Instance instance, PP_Size* size)
       OVERRIDE;
   virtual ::ppapi::thunk::PPB_Flash_API* GetFlashAPI() OVERRIDE;
-  virtual ::ppapi::thunk::PPB_Flash_Clipboard_API* GetFlashClipboardAPI(
-      PP_Instance instance) OVERRIDE;
-  virtual ::ppapi::thunk::PPB_Flash_Functions_API* GetFlashFunctionsAPI(
-      PP_Instance instance) OVERRIDE;
-  virtual ::ppapi::thunk::PPB_Gamepad_API* GetGamepadAPI(PP_Instance instance)
-      OVERRIDE;
+  virtual ::ppapi::Resource* GetSingletonResource(PP_Instance instance,
+      ::ppapi::SingletonResourceID id) OVERRIDE;
   virtual int32_t RequestInputEvents(PP_Instance instance,
                                      uint32_t event_classes) OVERRIDE;
   virtual int32_t RequestFilteringInputEvents(PP_Instance instance,
@@ -466,9 +460,12 @@ class WEBKIT_PLUGINS_EXPORT PluginInstance :
 
   // Implements PPB_Gamepad_API. This is just to avoid having an excessive
   // number of interfaces implemented by PluginInstance.
-  class GamepadImpl : public ::ppapi::thunk::PPB_Gamepad_API {
+  class GamepadImpl : public ::ppapi::thunk::PPB_Gamepad_API,
+                      public ::ppapi::Resource {
    public:
     explicit GamepadImpl(PluginDelegate* delegate);
+    // Resource implementation.
+    virtual ::ppapi::thunk::PPB_Gamepad_API* AsPPB_Gamepad_API() OVERRIDE;
     virtual void Sample(PP_GamepadsSampleData* data) OVERRIDE;
    private:
     PluginDelegate* delegate_;