Eliminate ash::internal namespace

ash/system/chromeos/brightness/tray_brightness.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_BRIGHTNESS_TRAY_BRIGHTNESS_H_
 #define ASH_SYSTEM_CHROMEOS_BRIGHTNESS_TRAY_BRIGHTNESS_H_
 
 #include "ash/system/tray/system_tray_item.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "chromeos/dbus/power_manager_client.h"
 
 namespace ash {
-namespace internal {
-
 namespace tray {
 class BrightnessView;
 }
 
 class ASH_EXPORT TrayBrightness
     : public SystemTrayItem,
       public chromeos::PowerManagerClient::Observer {
  public:
   explicit TrayBrightness(SystemTray* system_tray);
   virtual ~TrayBrightness();
@@ skipping 33 matching lines @@
   // Brightness level in the range [0.0, 100.0] that we've heard about most
   // recently.
   double current_percent_;
 
   // Has |current_percent_| been initialized?
   bool got_current_percent_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBrightness);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_BRIGHTNESS_TRAY_BRIGHTNESS_H_