Remove remaining calls to deprecated MessageLoop methods.

remoting/host/ipc_desktop_environment_unittest.cc

 // Copyright (c) 2013 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/ipc_desktop_environment.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
 #include "base/process/process.h"
 #include "base/process/process_handle.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "build/build_config.h"
 #include "ipc/attachment_broker_privileged.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_platform_file.h"
 #include "remoting/base/auto_thread.h"
 #include "remoting/base/auto_thread_task_runner.h"
 #include "remoting/base/constants.h"
@@ skipping 336 matching lines @@
   EXPECT_CALL(*desktop_environment, CreateMouseCursorMonitorPtr())
       .Times(AtMost(1))
       .WillOnce(Invoke(
           this, &IpcDesktopEnvironmentTest::CreateMouseCursorMonitor));
   EXPECT_CALL(*desktop_environment, GetCapabilities())
       .Times(AtMost(1));
   EXPECT_CALL(*desktop_environment, SetCapabilities(_))
       .Times(AtMost(1));
 
   // Let tests know that the remote desktop environment is created.
-  message_loop_.PostTask(FROM_HERE, setup_run_loop_->QuitClosure());
+  message_loop_.task_runner()->PostTask(FROM_HERE,
+                                        setup_run_loop_->QuitClosure());
 
   return desktop_environment;
 }
 
 InputInjector* IpcDesktopEnvironmentTest::CreateInputInjector() {
   EXPECT_TRUE(remote_input_injector_ == nullptr);
   remote_input_injector_ = new testing::StrictMock<MockInputInjector>();
 
   EXPECT_CALL(*remote_input_injector_, StartPtr(_));
   return remote_input_injector_;
@@ skipping 366 matching lines @@
       .WillOnce(InvokeWithoutArgs(
           this, &IpcDesktopEnvironmentTest::DeleteDesktopEnvironment));
 
   // Change the desktop resolution.
   screen_controls_->SetScreenResolution(ScreenResolution(
       webrtc::DesktopSize(100, 100),
       webrtc::DesktopVector(96, 96)));
 }
 
 }  // namespace remoting