Cleanup: Remove more unneeded browser_thread.h includes.

chrome/browser/browsing_data/browsing_data_quota_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_QUOTA_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_QUOTA_HELPER_H_
 
 #include <list>
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop_proxy.h"
 #include "base/sequenced_task_runner_helpers.h"
-#include "content/public/browser/browser_thread.h"
 #include "webkit/quota/quota_types.h"
 
 class BrowsingDataQuotaHelper;
 class Profile;
 
 struct BrowsingDataQuotaHelperDeleter {
   static void Destruct(const BrowsingDataQuotaHelper* helper);
 };
 
 // This class is an interface class to bridge between Cookies Tree and Unified
@@ skipping 45 matching lines @@
 
  private:
   friend class base::DeleteHelper<BrowsingDataQuotaHelper>;
   friend struct BrowsingDataQuotaHelperDeleter;
   scoped_refptr<base::MessageLoopProxy> io_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowsingDataQuotaHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_QUOTA_HELPER_H_