Cleanup: Remove more unneeded browser_thread.h includes.

chrome/browser/browsing_data/mock_browsing_data_quota_helper.cc

 // 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.
 
 #include "chrome/browser/browsing_data/mock_browsing_data_quota_helper.h"
 
+#include "content/public/browser/browser_thread.h"
+
 using content::BrowserThread;
 
 MockBrowsingDataQuotaHelper::MockBrowsingDataQuotaHelper(Profile* profile)
     : BrowsingDataQuotaHelper(BrowserThread::GetMessageLoopProxyForThread(
         BrowserThread::IO)) {}
 
 MockBrowsingDataQuotaHelper::~MockBrowsingDataQuotaHelper() {}
 
 void MockBrowsingDataQuotaHelper::StartFetching(
     const FetchResultCallback& callback) {
@@ skipping 17 matching lines @@
   AddHost("quotahost1", 1, 2);
   AddHost("quotahost2", 10, 20);
 }
 
 void MockBrowsingDataQuotaHelper::Notify() {
   CHECK_EQ(false, callback_.is_null());
   callback_.Run(response_);
   callback_.Reset();
   response_.clear();
 }