Convert URLLoader to the new proxy design

ppapi/thunk/ppb_url_loader_thunk.cc

 // 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.
 
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/shared_impl/tracked_callback.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/thunk.h"
 #include "ppapi/thunk/ppb_url_loader_api.h"
@@ skipping 93 matching lines @@
   if (enter.succeeded())
     enter.object()->Close();
 }
 
 void GrantUniversalAccess(PP_Resource loader) {
   EnterURLLoader enter(loader, true);
   if (enter.succeeded())
     enter.object()->GrantUniversalAccess();
 }
 
-void SetStatusCallback(PP_Resource loader,
-                       PP_URLLoaderTrusted_StatusCallback cb) {
-  EnterURLLoader enter(loader, true);
-  if (enter.succeeded())
-    enter.object()->SetStatusCallback(cb);
-}
-
 const PPB_URLLoader g_ppb_urlloader_thunk = {
   &Create,
   &IsURLLoader,
   &Open,
   &FollowRedirect,
   &GetUploadProgress,
   &GetDownloadProgress,
   &GetResponseInfo,
   &ReadResponseBody,
   &FinishStreamingToFile,
   &Close
 };
 
 const PPB_URLLoaderTrusted g_ppb_urlloader_trusted_thunk = {
   &GrantUniversalAccess,
-  &SetStatusCallback
+  NULL  // TODO(brettw) remove SetStatusCallback from the header.
 };
 
 }  // namespace
 
 const PPB_URLLoader_1_0* GetPPB_URLLoader_1_0_Thunk() {
   return &g_ppb_urlloader_thunk;
 }
 
 const PPB_URLLoaderTrusted_0_3* GetPPB_URLLoaderTrusted_0_3_Thunk() {
   return &g_ppb_urlloader_trusted_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi