Remove remaining calls to deprecated MessageLoop methods.

remoting/host/chromoting_host_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 "remoting/host/chromoting_host.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/ptr_util.h"
+#include "base/run_loop.h"
 #include "remoting/base/auto_thread_task_runner.h"
 #include "remoting/host/audio_capturer.h"
 #include "remoting/host/chromoting_host_context.h"
 #include "remoting/host/fake_desktop_environment.h"
 #include "remoting/host/fake_mouse_cursor_monitor.h"
 #include "remoting/host/host_mock_objects.h"
 #include "remoting/proto/video.pb.h"
 #include "remoting/protocol/errors.h"
 #include "remoting/protocol/fake_connection_to_client.h"
 #include "remoting/protocol/fake_desktop_capturer.h"
@@ skipping 122 matching lines @@
       client_ptr->OnConnectionClosed(connection_ptr,
                                  protocol::AUTHENTICATION_FAILED);
     }
   }
 
   void TearDown() override {
     if (host_)
       ShutdownHost();
     task_runner_ = nullptr;
 
-    message_loop_.RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
   }
 
   void DisconnectAllClients() {
     host_->DisconnectAllClients();
   }
 
   void NotifyConnectionClosed1() {
     if (session_unowned1_event_handler_) {
       session_unowned1_event_handler_->OnSessionStateChange(Session::CLOSED);
     }
@@ skipping 224 matching lines @@
 
   ExpectClientConnected(0);
   SimulateClientConnection(0, true, false);
 
   ExpectClientDisconnected(0);
   DisconnectAllClients();
   testing::Mock::VerifyAndClearExpectations(&host_status_observer_);
 }
 
 }  // namespace remoting