Remove remaining calls to deprecated MessageLoop methods.

remoting/host/desktop_process_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/desktop_process.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 230 matching lines @@
   return new FakeMouseCursorMonitor();
 }
 
 void DesktopProcessTest::DisconnectChannels() {
   daemon_channel_.reset();
   network_channel_.reset();
   io_task_runner_ = nullptr;
 }
 
 void DesktopProcessTest::PostDisconnectChannels() {
-  message_loop_.PostTask(FROM_HERE, base::Bind(
-      &DesktopProcessTest::DisconnectChannels, base::Unretained(this)));
+  message_loop_.task_runner()->PostTask(
+      FROM_HERE, base::Bind(&DesktopProcessTest::DisconnectChannels,
+                            base::Unretained(this)));
 }
 
 void DesktopProcessTest::RunDesktopProcess() {
   base::RunLoop run_loop;
   base::Closure quit_ui_task_runner = base::Bind(
       base::IgnoreResult(&base::SingleThreadTaskRunner::PostTask),
       message_loop_.task_runner(),
       FROM_HERE, run_loop.QuitClosure());
   scoped_refptr<AutoThreadTaskRunner> ui_task_runner = new AutoThreadTaskRunner(
       message_loop_.task_runner(), quit_ui_task_runner);
@@ skipping 91 matching lines @@
 }
 
 // Run the desktop process and ask it to crash.
 TEST_F(DesktopProcessTest, DeathTest) {
   testing::GTEST_FLAG(death_test_style) = "threadsafe";
 
   EXPECT_DEATH(RunDeathTest(), "");
 }
 
 }  // namespace remoting