Use a direct include of the message_loop header in chrome/browser/, part 7.

chrome/browser/metrics/thread_watcher.h

 // 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.
 
 // This file defines a WatchDog thread that monitors the responsiveness of other
 // browser threads like UI, IO, DB, FILE and CACHED threads. It also defines
 // ThreadWatcher class which performs health check on threads that would like to
 // be watched. This file also defines ThreadWatcherList class that has list of
 // all active ThreadWatcher objects.
 //
@@ skipping 33 matching lines @@
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread.h"
 #include "base/threading/watchdog.h"
 #include "base/time/time.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
@@ skipping 559 matching lines @@
   // shutdown_watchdog_ watches for hangs during shutdown.
   base::Watchdog* shutdown_watchdog_;
 
   // The |thread_id_| on which this object is constructed.
   const base::PlatformThreadId thread_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ShutdownWatcherHelper);
 };
 
 #endif  // CHROME_BROWSER_METRICS_THREAD_WATCHER_H_