Eliminate ash::internal namespace

ash/system/date/tray_date.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_DATE_TRAY_DATE_H_
 #define ASH_SYSTEM_DATE_TRAY_DATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/system/date/clock_observer.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace views {
 class Label;
 }
 
 namespace ash {
-namespace internal {
-
+class DateDefaultView;
 #if defined(OS_CHROMEOS)
 class SystemClockObserver;
 #endif
-class DateDefaultView;
 
 namespace tray {
 class TimeView;
 }
 
 class ASH_EXPORT TrayDate : public SystemTrayItem, public ClockObserver {
  public:
   enum ClockLayout {
    HORIZONTAL_CLOCK,
    VERTICAL_CLOCK,
@@ skipping 30 matching lines @@
   tray::TimeView* time_tray_;
   DateDefaultView* default_view_;
 
 #if defined(OS_CHROMEOS)
   scoped_ptr<SystemClockObserver> system_clock_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(TrayDate);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_DATE_TRAY_DATE_H_