Use macros to define pepper interfaces

ppapi/proxy/ppb_graphics_3d_proxy.h

Index: ppapi/proxy/ppb_graphics_3d_proxy.h
diff --git a/ppapi/proxy/ppb_graphics_3d_proxy.h b/ppapi/proxy/ppb_graphics_3d_proxy.h
index db67a2ff451c8492788b929e277230b44d189a91..dae7e5447933c24473acbb4b34249808a6579d3f 100644
--- a/ppapi/proxy/ppb_graphics_3d_proxy.h
+++ b/ppapi/proxy/ppb_graphics_3d_proxy.h
@@ -63,22 +63,18 @@ class Graphics3D : public Resource, public Graphics3DImpl {
 
 class PPB_Graphics3D_Proxy : public InterfaceProxy {
  public:
-  PPB_Graphics3D_Proxy(Dispatcher* dispatcher, const void* target_interface);
+  PPB_Graphics3D_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Graphics3D_Proxy();
 
-  static const Info* GetInfo();
-
   static PP_Resource CreateProxyResource(PP_Instance instance,
                                          PP_Resource share_context,
                                          const int32_t* attrib_list);
 
-  const PPB_Graphics3D_Dev* ppb_graphics_3d_target() const {
-    return static_cast<const PPB_Graphics3D_Dev*>(target_interface());
-  }
-
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
+  static const InterfaceID kInterfaceID = INTERFACE_ID_PPB_GRAPHICS_3D;
+
  private:
   void OnMsgCreate(PP_Instance instance,
                    const std::vector<int32_t>& attribs,