Get rid of MessageLoop* caching in extensions code.

chrome/browser/web_resource/web_resource_service.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.
 #include "chrome/browser/web_resource/web_resource_service.h"
 
 #include "base/command_line.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 100 matching lines @@
         web_resource_service_->resource_dispatcher_host_ != NULL &&
         !CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess);
 
 #if defined(OS_POSIX)
     // TODO(port): Don't use a utility process on linux (crbug.com/22703) or
     // MacOS (crbug.com/8102) until problems related to autoupdate are fixed.
     use_utility_process = false;
 #endif
 
     if (use_utility_process) {
+      ChromeThread::ID thread_id;
+      CHECK(ChromeThread::GetCurrentThreadIdentifier(&thread_id));
       ChromeThread::PostTask(
           ChromeThread::IO, FROM_HERE,
           NewRunnableMethod(this, &UnpackerClient::StartProcessOnIOThread,
                             web_resource_service_->resource_dispatcher_host_,
-                            MessageLoop::current()));
+                            thread_id));
     } else {
       WebResourceUnpacker unpacker(json_data_);
       if (unpacker.Run()) {
         OnUnpackWebResourceSucceeded(*unpacker.parsed_json());
       } else {
         OnUnpackWebResourceFailed(unpacker.error_message());
       }
     }
   }
 
@@ skipping 21 matching lines @@
   // Release reference and set got_response_.
   void Cleanup() {
     if (got_response_)
       return;
 
     got_response_ = true;
     Release();
   }
 
   void StartProcessOnIOThread(ResourceDispatcherHost* rdh,
-                              MessageLoop* file_loop) {
-    UtilityProcessHost* host = new UtilityProcessHost(rdh, this, file_loop);
+                              ChromeThread::ID thread_id) {
+    UtilityProcessHost* host = new UtilityProcessHost(rdh, this, thread_id);
     // TODO(mrc): get proper file path when we start using web resources
     // that need to be unpacked.
     host->StartWebResourceUnpacker(json_data_);
   }
 
   scoped_refptr<WebResourceService> web_resource_service_;
 
   // Holds raw JSON string.
   const std::string& json_data_;
 
@@ skipping 129 matching lines @@
   // languages, which can be different from the locale.
   std::wstring languageList = prefs->GetString(prefs::kAcceptLanguages);
   int pos = languageList.find(L",");
   pos = pos >= 0 ? pos : languageList.length();
   return languageList.substr(0, pos);
 #else
   return ASCIIToWide(g_browser_process->GetApplicationLocale());
 #endif
 }