Use a direct include of the message_loop header in base/.

base/timer/hi_res_timer_manager_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/timer/hi_res_timer_manager.h"
 
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/power_monitor/power_monitor.h"
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 #if defined(OS_WIN)
 // http://crbug.com/114048
 TEST(HiResTimerManagerTest, DISABLED_ToggleOnOff) {
   base::MessageLoop loop;
@@ skipping 29 matching lines @@
     EXPECT_TRUE(manager.hi_res_clock_available());
     EXPECT_TRUE(base::Time::IsHighResolutionTimerInUse());
 
     // De-activate the high resolution timer.
     base::Time::ActivateHighResolutionTimer(false);
   }
 }
 #endif  // defined(OS_WIN)
 
 }  // namespace base