Get rid of MessageLoop* caching in extensions code.

chrome/browser/renderer_host/resource_dispatcher_host.cc

 // Copyright (c) 2009 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "chrome/browser/renderer_host/resource_dispatcher_host.h"
 
 #include <vector>
 
@@ skipping 241 matching lines @@
 
 ResourceDispatcherHost::ResourceDispatcherHost(MessageLoop* io_loop)
     : ui_loop_(MessageLoop::current()),
       io_loop_(io_loop),
       ALLOW_THIS_IN_INITIALIZER_LIST(
           download_file_manager_(new DownloadFileManager(this))),
       download_request_manager_(new DownloadRequestManager(io_loop, ui_loop_)),
       ALLOW_THIS_IN_INITIALIZER_LIST(
           save_file_manager_(new SaveFileManager(ui_loop_, io_loop, this))),
       ALLOW_THIS_IN_INITIALIZER_LIST(user_script_listener_(
-          new UserScriptListener(ui_loop_, io_loop, this))),
+          new UserScriptListener(this))),
       safe_browsing_(new SafeBrowsingService),
       webkit_thread_(new WebKitThread),
       request_id_(-1),
       ALLOW_THIS_IN_INITIALIZER_LIST(method_runner_(this)),
       is_shutdown_(false),
       max_outstanding_requests_cost_per_process_(
           kMaxOutstandingRequestsCostPerProcess),
       receiver_(NULL) {
 }
 
@@ skipping 1526 matching lines @@
     case ViewHostMsg_UploadProgress_ACK::ID:
     case ViewHostMsg_SyncLoad::ID:
       return true;
 
     default:
       break;
   }
 
   return false;
 }