Have content/ create and destroy its own threads.

chrome/browser/translate/translate_manager.cc

 // Copyright (c) 2011 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/translate/translate_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/json/json_reader.h"
 #include "base/memory/singleton.h"
+#include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/infobars/infobar_tab_helper.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/tab_contents/language_state.h"
 #include "chrome/browser/tab_contents/tab_util.h"
@@ skipping 806 matching lines @@
   InfoBarTabHelper* infobar_helper = wrapper->infobar_tab_helper();
 
   for (size_t i = 0; i < infobar_helper->infobar_count(); ++i) {
     TranslateInfoBarDelegate* delegate =
         infobar_helper->GetInfoBarDelegateAt(i)->AsTranslateInfoBarDelegate();
     if (delegate)
       return delegate;
   }
   return NULL;
 }