Remove call to MessageLoop::QuitWhenIdle() in network_time_tracker.cc.

components/network_time/network_time_tracker.h

 // 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.
 
 #ifndef COMPONENTS_NETWORK_TIME_NETWORK_TIME_TRACKER_H_
 #define COMPONENTS_NETWORK_TIME_NETWORK_TIME_TRACKER_H_
 
 #include <stdint.h>
 #include <memory>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/clock.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "url/gurl.h"
 
 class PrefRegistrySimple;
 class PrefService;
 
 namespace base {
-class MessageLoop;
+class RunLoop;
 class TickClock;
 }  // namespace base
 
 namespace client_update_protocol {
 class Ecdsa;
 }  // namespace client_update_protocol
 
 namespace net {
 class URLFetcher;
 class URLRequestContextGetter;
@@ skipping 101 matching lines @@
   size_t max_response_size_;
   base::TimeDelta backoff_;
   // Timer that runs CheckTime().  All backoff and delay is implemented by
   // changing the delay of this timer, with the result that CheckTime() may
   // assume that if it runs, it is eligible to issue a time query.
   base::RepeatingTimer timer_;
   scoped_refptr<net::URLRequestContextGetter> getter_;
   std::unique_ptr<net::URLFetcher> time_fetcher_;
   base::TimeTicks fetch_started_;
   std::unique_ptr<client_update_protocol::Ecdsa> query_signer_;
-  base::MessageLoop* loop_;  // For testing; quit on fetch complete.
+
+  // Run by WaitForFetchForTesting() and quit by OnURLFetchComplete().
+  base::RunLoop* run_loop_for_testing_ = nullptr;
 
   // The |Clock| and |TickClock| are used to sanity-check one another, allowing
   // the NetworkTimeTracker to notice e.g. suspend/resume events and clock
   // resets.
   std::unique_ptr<base::Clock> clock_;
   std::unique_ptr<base::TickClock> tick_clock_;
 
   PrefService* pref_service_;
 
   // Network time based on last call to UpdateNetworkTime().
@@ skipping 12 matching lines @@
   base::TimeDelta network_time_uncertainty_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkTimeTracker);
 };
 
 }  // namespace network_time
 
 #endif  // COMPONENTS_NETWORK_TIME_NETWORK_TIME_TRACKER_H_