Eliminate ash::internal namespace

ash/display/display_error_observer_chromeos.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_DISPLAY_DISPLAY_ERROR_OBSERVER_CHROMEOS_H_
 #define ASH_DISPLAY_DISPLAY_ERROR_OBSERVER_CHROMEOS_H_
 
 #include "ash/ash_export.h"
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
 #include "ui/display/chromeos/output_configurator.h"
 
 namespace ash {
-namespace internal {
 
 // The class to observe the output failures and shows the error dialog when
 // necessary.
 class ASH_EXPORT DisplayErrorObserver
     : public ui::OutputConfigurator::Observer {
  public:
   DisplayErrorObserver();
   virtual ~DisplayErrorObserver();
 
   // ui::OutputConfigurator::Observer overrides:
   virtual void OnDisplayModeChangeFailed(ui::OutputState failed_new_state)
       OVERRIDE;
 
  private:
   friend class DisplayErrorObserverTest;
 
   base::string16 GetTitleOfDisplayErrorNotificationForTest();
 
   DISALLOW_COPY_AND_ASSIGN(DisplayErrorObserver);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_ERROR_OBSERVER_CHROMEOS_H_