Convert URLLoader to the new proxy design

ppapi/proxy/plugin_resource.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_PROXY_PLUGIN_RESOURCE_H_
 #define PPAPI_PROXY_PLUGIN_RESOURCE_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 113 matching lines @@
       Destination dest, const IPC::Message& msg, A* a, B* b, C* c, D* d);
   template <class ReplyMsgClass, class A, class B, class C, class D, class E>
   int32_t SyncCall(
       Destination dest, const IPC::Message& msg, A* a, B* b, C* c, D* d, E* e);
 
   int32_t GenericSyncCall(Destination dest,
                           const IPC::Message& msg,
                           IPC::Message* reply_msg,
                           ResourceMessageReplyParams* reply_params);
 
+  const Connection& connection() { return connection_; }
+
  private:
   IPC::Sender* GetSender(Destination dest) {
     return dest == RENDERER ? connection_.renderer_sender :
                               connection_.browser_sender;
   }
 
   // Helper function to send a |PpapiHostMsg_ResourceCall| to the given
   // destination with |nested_msg| and |call_params|.
   bool SendResourceCall(Destination dest,
                         const ResourceMessageCallParams& call_params,
@@ skipping 95 matching lines @@
 
   if (UnpackMessage<ReplyMsgClass>(reply, a, b, c, d, e))
     return result;
   return PP_ERROR_FAILED;
 }
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PLUGIN_RESOURCE_H_