Use macros to define pepper interfaces

ppapi/proxy/ppb_url_loader_proxy.h

Index: ppapi/proxy/ppb_url_loader_proxy.h
diff --git a/ppapi/proxy/ppb_url_loader_proxy.h b/ppapi/proxy/ppb_url_loader_proxy.h
index 17825f102c83a05f6d02c5e84784a45d8a0b4b3b..defae9ba6552b873df1a6e6328e96d9baebc35dd 100644
--- a/ppapi/proxy/ppb_url_loader_proxy.h
+++ b/ppapi/proxy/ppb_url_loader_proxy.h
@@ -29,10 +29,9 @@ struct PPBURLLoader_UpdateProgress_Params;
 
 class PPB_URLLoader_Proxy : public InterfaceProxy {
  public:
-  PPB_URLLoader_Proxy(Dispatcher* dispatcher, const void* target_interface);
+  PPB_URLLoader_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_URLLoader_Proxy();
 
-  static const Info* GetInfo();
   static const Info* GetTrustedInfo();
 
   static PP_Resource CreateProxyResource(PP_Instance instance);
@@ -44,10 +43,6 @@ class PPB_URLLoader_Proxy : public InterfaceProxy {
   static PP_Resource TrackPluginResource(
       const ppapi::HostResource& url_loader_resource);
 
-  const PPB_URLLoader* ppb_url_loader_target() const {
-    return reinterpret_cast<const PPB_URLLoader*>(target_interface());
-  }
-
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
@@ -57,6 +52,8 @@ class PPB_URLLoader_Proxy : public InterfaceProxy {
   // time you're sending a new URLLoader that the plugin hasn't seen yet.
   void PrepareURLLoaderForSendingToPlugin(PP_Resource resource);
 
+  static const InterfaceID kInterfaceID = INTERFACE_ID_PPB_URL_LOADER;
+
  private:
   // Data associated with callbacks for ReadResponseBody.
   struct ReadCallbackInfo;