Use a direct include of the message_loop header in content/, part 1.

content/browser/device_orientation/provider_impl.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 "content/browser/device_orientation/provider_impl.h"
 
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/logging.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/threading/thread.h"
 #include "base/threading/worker_pool.h"
 
 namespace {
 
 void DeleteThread(base::Thread* thread) {
   delete thread;
 }
 
 }
@@ skipping 260 matching lines @@
         observers_.erase(current);
     }
 
     if (observers_.empty())
       Stop();
   }
 }
 
 
 }  // namespace content