Convert URLLoader to the new proxy design

ppapi/proxy/ppp_instance_proxy.h

Index: ppapi/proxy/ppp_instance_proxy.h
diff --git a/ppapi/proxy/ppp_instance_proxy.h b/ppapi/proxy/ppp_instance_proxy.h
index 1b599d086f565c8b8ed1b82df70a1c1840f65e92..49ba7ba1a1918b28b8823f4b4c782efdea2a8cf0 100644
--- a/ppapi/proxy/ppp_instance_proxy.h
+++ b/ppapi/proxy/ppp_instance_proxy.h
@@ -20,6 +20,7 @@ struct PP_Rect;
 
 namespace ppapi {
 
+struct URLResponseInfoData;
 struct ViewData;
 
 namespace proxy {
@@ -50,8 +51,8 @@ class PPP_Instance_Proxy : public InterfaceProxy {
                                 PP_Bool flash_fullscreen);
   void OnPluginMsgDidChangeFocus(PP_Instance instance, PP_Bool has_focus);
   void OnPluginMsgHandleDocumentLoad(PP_Instance instance,
-                                     const HostResource& url_loader,
-                                     PP_Bool* result);
+                                     int pending_loader_host_id,
+                                     const URLResponseInfoData& data);
   scoped_ptr<PPP_Instance_Combined> combined_interface_;
 };