Remove calls to deprecated MessageLoop methods on Windows and Linux.

base/message_loop/message_loop_task_runner_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 "base/message_loop/message_loop_task_runner.h"
 
 #include <memory>
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
@@ skipping 19 matching lines @@
 
   void DeleteCurrentMessageLoop() { current_loop_.reset(); }
 
  protected:
   void SetUp() override {
     // Use SetUp() instead of the constructor to avoid posting a task to a
     // partially constructed object.
     task_thread_.Start();
 
     // Allow us to pause the |task_thread_|'s MessageLoop.
-    task_thread_.message_loop()->task_runner()->PostTask(
+    task_thread_.task_runner()->PostTask(
         FROM_HERE, Bind(&MessageLoopTaskRunnerTest::BlockTaskThreadHelper,
                         Unretained(this)));
   }
 
   void TearDown() override {
     // Make sure the |task_thread_| is not blocked, and stop the thread
     // fully before destruction because its tasks may still depend on the
     // |thread_sync_| event.
     thread_sync_.Signal();
     task_thread_.Stop();
@@ skipping 302 matching lines @@
         new Thread("MessageLoopTaskRunnerThreadingTest_Dummy"));
     test_thread->Start();
     task_runner = test_thread->task_runner();
   }
   bool ret = task_runner->PostTask(
       FROM_HERE, Bind(&MessageLoopTaskRunnerThreadingTest::AssertNotRun));
   EXPECT_FALSE(ret);
 }
 
 }  // namespace base