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 4fd97a20256e5d09ea4f5b608c86b0df05d5e0ad..ef2b70b805f62bad8bb213987d0009c983a0a1cb 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* ppb_graphics_3d_target() const {
-    return static_cast<const PPB_Graphics3D*>(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,