Eliminate ash::internal namespace

ash/system/chromeos/power/video_activity_notifier.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 ASH_SYSTEM_CHROMEOS_POWER_VIDEO_ACTIVITY_NOTIFIER_H_
 #define ASH_SYSTEM_CHROMEOS_POWER_VIDEO_ACTIVITY_NOTIFIER_H_
 
 #include "ash/wm/video_detector.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
 
 namespace ash {
-namespace internal {
 
 // Notifies the power manager when a video is playing.
 class VideoActivityNotifier : public VideoDetectorObserver,
                               public ShellObserver {
  public:
   explicit VideoActivityNotifier(VideoDetector* detector);
   virtual ~VideoActivityNotifier();
 
   // VideoDetectorObserver implementation.
   virtual void OnVideoDetected(bool is_fullscreen) OVERRIDE;
 
   // ShellObserver implementation.
   virtual void OnLockStateChanged(bool locked) OVERRIDE;
 
  private:
   VideoDetector* detector_;  // not owned
 
   // Last time that the power manager was notified.
   base::TimeTicks last_notify_time_;
 
   // True if the screen is currently locked.
   bool screen_is_locked_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoActivityNotifier);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_POWER_VIDEO_ACTIVITY_NOTIFIER_H_