Eliminate ash::internal namespace

ash/system/user/tray_user_separator.cc

 // 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.
 
 #include "ash/system/user/tray_user_separator.h"
 
 #include "ash/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ui/views/view.h"
 
 namespace ash {
-namespace internal {
 
 TrayUserSeparator::TrayUserSeparator(SystemTray* system_tray)
     : SystemTrayItem(system_tray),
       separator_shown_(false) {
 }
 
 views::View* TrayUserSeparator::CreateTrayView(user::LoginStatus status) {
   return NULL;
 }
 
@@ skipping 14 matching lines @@
 }
 
 views::View* TrayUserSeparator::CreateDetailedView(user::LoginStatus status) {
   return NULL;
 }
 
 void TrayUserSeparator::DestroyDefaultView() {
   separator_shown_ = false;
 }
 
-}  // namespace internal
 }  // namespace ash