Use macros to define pepper interfaces

ppapi/proxy/ppb_graphics_2d_proxy.h

Index: ppapi/proxy/ppb_graphics_2d_proxy.h
diff --git a/ppapi/proxy/ppb_graphics_2d_proxy.h b/ppapi/proxy/ppb_graphics_2d_proxy.h
index cd4c55f2485f3a3e5999f1087e7a162bccbb5e4c..59b4b1b0a70a952673bbe18297cb43ef714df6ad 100644
--- a/ppapi/proxy/ppb_graphics_2d_proxy.h
+++ b/ppapi/proxy/ppb_graphics_2d_proxy.h
@@ -26,22 +26,18 @@ namespace proxy {
 
 class PPB_Graphics2D_Proxy : public InterfaceProxy {
  public:
-  PPB_Graphics2D_Proxy(Dispatcher* dispatcher, const void* target_interface);
+  PPB_Graphics2D_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Graphics2D_Proxy();
 
-  static const Info* GetInfo();
-
   static PP_Resource CreateProxyResource(PP_Instance instance,
                                          const PP_Size& size,
                                          PP_Bool is_always_opaque);
 
-  const PPB_Graphics2D* ppb_graphics_2d_target() const {
-    return static_cast<const PPB_Graphics2D*>(target_interface());
-  }
-
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
+  static const InterfaceID kInterfaceID = INTERFACE_ID_PPB_GRAPHICS_2D;
+
  private:
   // Plugin->renderer message handlers.
   void OnMsgPaintImageData(const ppapi::HostResource& graphics_2d,
@@ -67,6 +63,8 @@ class PPB_Graphics2D_Proxy : public InterfaceProxy {
 
   pp::CompletionCallbackFactory<PPB_Graphics2D_Proxy,
                                 ProxyNonThreadSafeRefCount> callback_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PPB_Graphics2D_Proxy);
 };
 
 }  // namespace proxy