Eliminate ash::internal namespace

ash/system/overview/overview_button_tray.cc

 // Copyright 2014 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/overview/overview_button_tray.h"
 
 #include "ash/shelf/shelf_types.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/tray_utils.h"
@@ skipping 11 matching lines @@
 // border of the icon, depending on the current shelf_alignment()
 const int kHorizontalShelfHorizontalPadding = 8;
 const int kHorizontalShelfVerticalPadding = 4;
 const int kVerticalShelfHorizontalPadding = 2;
 const int kVerticalShelfVerticalPadding = 5;
 
 }  // namespace
 
 namespace ash {
 
-OverviewButtonTray::OverviewButtonTray(
-    internal::StatusAreaWidget* status_area_widget)
-    : TrayBackgroundView(status_area_widget),
-      icon_(NULL) {
+OverviewButtonTray::OverviewButtonTray(StatusAreaWidget* status_area_widget)
+    : TrayBackgroundView(status_area_widget), icon_(NULL) {
   SetContentsBackground();
 
   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
   icon_ = new views::ImageView();
   icon_->SetImage(
       bundle.GetImageNamed(IDR_AURA_UBER_TRAY_OVERVIEW_MODE).ToImageSkia());
   SetIconBorderForShelfAlignment();
   tray_container()->AddChildView(icon_);
 
   UpdateIconVisibility(Shell::GetInstance()->
@@ skipping 66 matching lines @@
         kVerticalShelfHorizontalPadding));
   }
 }
 
 void OverviewButtonTray::UpdateIconVisibility(bool maximize_mode_enabled) {
   SetVisible(maximize_mode_enabled &&
              Shell::GetInstance()->window_selector_controller()->CanSelect());
 }
 
 }  // namespace ash