Eliminate ash::internal namespace

ash/system/chromeos/power/user_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_USER_ACTIVITY_NOTIFIER_H_
 #define ASH_SYSTEM_CHROMEOS_POWER_USER_ACTIVITY_NOTIFIER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
 #include "ui/wm/core/user_activity_observer.h"
 
 namespace wm {
 class UserActivityDetector;
 }  // namespace wm
 
 namespace ash {
-namespace internal {
 
 // Notifies the power manager when the user is active.
 class UserActivityNotifier : public ::wm::UserActivityObserver {
  public:
   explicit UserActivityNotifier(::wm::UserActivityDetector* detector);
   virtual ~UserActivityNotifier();
 
   // UserActivityObserver implementation.
   virtual void OnUserActivity(const ui::Event* event) OVERRIDE;
 
  private:
   ::wm::UserActivityDetector* detector_;  // not owned
 
   // Last time that the power manager was notified.
   base::TimeTicks last_notify_time_;
 
   DISALLOW_COPY_AND_ASSIGN(UserActivityNotifier);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_POWER_USER_ACTIVITY_NOTIFIER_H_