Eliminate ash::internal namespace

ash/system/chromeos/tray_display.h

 // Copyright (c) 2012 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_TRAY_DISPLAY_H_
 #define ASH_SYSTEM_CHROMEOS_TRAY_DISPLAY_H_
 
 #include <map>
 
 #include "ash/ash_export.h"
 #include "ash/display/display_controller.h"
 #include "ash/display/display_info.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "base/strings/string16.h"
 #include "ui/views/view.h"
 
 namespace ash {
+class DisplayView;
+
 namespace test {
 class AshTestBase;
 }
 
-namespace internal {
-class DisplayView;
-
 class ASH_EXPORT TrayDisplay : public SystemTrayItem,
                                public DisplayController::Observer {
  public:
   explicit TrayDisplay(SystemTray* system_tray);
   virtual ~TrayDisplay();
 
   // Overridden from DisplayControllerObserver:
   virtual void OnDisplayConfigurationChanged() OVERRIDE;
 
  private:
@@ skipping 32 matching lines @@
   const views::View* default_view() const {
     return reinterpret_cast<views::View*>(default_);
   }
 
   DisplayView* default_;
   DisplayInfoMap display_info_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayDisplay);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_TRAY_DISPLAY_H_