Get rid of MessageLoop* caching in extensions code.

chrome/browser/profile.cc

 // Copyright (c) 2006-2008 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/profile.h"
 
 #include "app/theme_provider.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 650 matching lines @@
       std::wstring path_string =
           command_line->GetSwitchValue(switches::kUserScriptsDir);
       script_dir = FilePath::FromWStringHack(path_string);
     } else {
       script_dir = GetPath();
       script_dir = script_dir.Append(chrome::kUserScriptsDirname);
     }
   }
 
   ExtensionErrorReporter::Init(true);  // allow noisy errors.
-  user_script_master_ = new UserScriptMaster(
-      g_browser_process->file_thread()->message_loop(),
-      script_dir);
+  user_script_master_ = new UserScriptMaster(script_dir);
   extensions_service_ = new ExtensionsService(
       this,
       CommandLine::ForCurrentProcess(),
       GetPrefs(),
       GetPath().AppendASCII(ExtensionsService::kInstallDirectoryName),
-      MessageLoop::current(),
-      g_browser_process->file_thread()->message_loop(),
       true);
 
   extensions_service_->Init();
 
   // Load any extensions specified with --load-extension.
   if (command_line->HasSwitch(switches::kLoadExtension)) {
     std::wstring path_string =
         command_line->GetSwitchValue(switches::kLoadExtension);
     FilePath path = FilePath::FromWStringHack(path_string);
     extensions_service_->LoadExtension(path);
@@ skipping 684 matching lines @@
     return sync_service_.get();
   }
 #endif
   return NULL;
 }
 
 void ProfileImpl::InitSyncService() {
   sync_service_.reset(new ProfileSyncService(this));
   sync_service_->Initialize();
 }