Cleanup: Remove unneeded browser_thread.h includes in content/.

content/browser/power_monitor_message_broadcaster.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_BROWSER_POWER_MONITOR_MESSAGE_BROADCASTER_H_
 #define CONTENT_BROWSER_POWER_MONITOR_MESSAGE_BROADCASTER_H_
 
 #include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
 #include "base/power_monitor/power_observer.h"
 #include "content/common/content_export.h"
-#include "content/public/browser/browser_thread.h"
 
 namespace IPC {
-  class Sender;
+class Sender;
 }
 
 namespace content {
 
 // A class used to monitor the power state change and communicate it to child
 // processes via IPC.
 class CONTENT_EXPORT PowerMonitorMessageBroadcaster
     : public base::PowerObserver {
  public:
   explicit PowerMonitorMessageBroadcaster(IPC::Sender* sender);
   virtual ~PowerMonitorMessageBroadcaster();
 
   // Implement PowerObserver.
   virtual void OnPowerStateChange(bool on_battery_power) OVERRIDE;
   virtual void OnSuspend() OVERRIDE;
   virtual void OnResume() OVERRIDE;
 
  private:
   IPC::Sender* sender_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerMonitorMessageBroadcaster);
 };
 
-}  // namespace base
+}  // namespace content
 
 #endif  // CONTENT_BROWSER_POWER_MONITOR_MESSAGE_BROADCASTER_H_