Remove calls to deprecated MessageLoop methods in chrome.

chrome/browser/predictors/resource_prefetch_predictor_unittest.cc

 // Copyright 2014 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/predictors/resource_prefetch_predictor.h"
 
 #include <iostream>
 #include <memory>
 
 #include "base/memory/ref_counted.h"
@@ skipping 162 matching lines @@
     : loop_(base::MessageLoop::TYPE_DEFAULT),
       ui_thread_(content::BrowserThread::UI, &loop_),
       db_thread_(content::BrowserThread::DB, &loop_),
       profile_(new TestingProfile()),
       mock_tables_(new StrictMock<MockResourcePrefetchPredictorTables>()),
       empty_url_data_(PREFETCH_KEY_TYPE_URL, std::string()),
       empty_host_data_(PREFETCH_KEY_TYPE_HOST, std::string()) {}
 
 ResourcePrefetchPredictorTest::~ResourcePrefetchPredictorTest() {
   profile_.reset(NULL);
-  loop_.RunUntilIdle();
+  base::RunLoop().RunUntilIdle();
 }
 
 void ResourcePrefetchPredictorTest::SetUp() {
   InitializeSampleData();
 
   ASSERT_TRUE(profile_->CreateHistoryService(true, false));
   profile_->BlockUntilHistoryProcessesPendingRequests();
   EXPECT_TRUE(HistoryServiceFactory::GetForProfile(
       profile_.get(), ServiceAccessType::EXPLICIT_ACCESS));
   // Initialize the predictor with empty data.
@@ skipping 769 matching lines @@
   // The page load time will be collected by RPP_HISTOGRAM_MEDIUM_TIMES, which
   // has a upper bound of 3 minutes.
   base::TimeDelta plt =
       predictor_->OnNavigationComplete(main_frame.navigation_id);
   EXPECT_LT(plt, base::TimeDelta::FromSeconds(180));
 
   profile_->BlockUntilHistoryProcessesPendingRequests();
 }
 
 }  // namespace predictors