Call scoped_refptr<T>::get() rather than relying on implicit "operator T*"

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)) {}
+          BrowserThread::IO).get()) {}
 
 MockBrowsingDataQuotaHelper::~MockBrowsingDataQuotaHelper() {}
 
 void MockBrowsingDataQuotaHelper::StartFetching(
     const FetchResultCallback& callback) {
   callback_ = callback;
 }
 
 void MockBrowsingDataQuotaHelper::RevokeHostQuota(const std::string& host) {
 }
@@ skipping 14 matching lines @@
   AddHost("quotahost1", 1, 2, 1);
   AddHost("quotahost2", 10, 20, 10);
 }
 
 void MockBrowsingDataQuotaHelper::Notify() {
   CHECK_EQ(false, callback_.is_null());
   callback_.Run(response_);
   callback_.Reset();
   response_.clear();
 }