Remove calls to deprecated MessageLoop methods in sync.

sync/engine/sync_scheduler_unittest.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 <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
@@ skipping 57 matching lines @@
 
 void QuitLoopNow() {
   // We use QuitNow() instead of Quit() as the latter may get stalled
   // indefinitely in the presence of repeated timers with low delays
   // and a slow test (e.g., ThrottlingDoesThrottle [which has a poll
   // delay of 5ms] run under TSAN on the trybots).
   base::MessageLoop::current()->QuitNow();
 }
 
 void RunLoop() {
-  base::MessageLoop::current()->Run();
+  base::RunLoop().Run();
 }
 
 void PumpLoop() {
   // Do it this way instead of RunAllPending to pump loop exactly once
   // (necessary in the presence of timers; see comment in
   // QuitLoopNow).
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                 base::Bind(&QuitLoopNow));
   RunLoop();
 }
@@ skipping 1381 matching lines @@
   ASSERT_TRUE(scheduler()->IsBackingOff());
 
   // Now succeed.
   connection()->SetServerReachable();
   PumpLoopFor(2 * delta);
   ASSERT_EQ(1, success_counter.times_called());
   ASSERT_FALSE(scheduler()->IsBackingOff());
 }
 
 }  // namespace syncer