Eliminate ash::internal namespace

ash/system/overview/overview_button_tray_unittest.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/display/display_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/shelf/shelf_widget.h"
@@ skipping 11 matching lines @@
 namespace ash {
 
 namespace {
 
 OverviewButtonTray* GetTray() {
   return Shell::GetPrimaryRootWindowController()->shelf()->
       status_area_widget()->overview_button_tray();
 }
 
 OverviewButtonTray* GetSecondaryTray() {
-  internal::RootWindowController* primary_controller =
+  RootWindowController* primary_controller =
       Shell::GetPrimaryRootWindowController();
   Shell::RootWindowControllerList controllers =
       Shell::GetAllRootWindowControllers();
   for (size_t i = 0; i < controllers.size(); ++i) {
     if (controllers[i] != primary_controller) {
       return controllers[i]->shelf()->
           status_area_widget()->overview_button_tray();
     }
   }
 
@@ skipping 84 matching lines @@
   Shell::GetInstance()->UpdateAfterLoginStatusChange(user::LOGGED_IN_NONE);
   EXPECT_FALSE(GetTray()->visible());
   SetUserLoggedIn(true);
   SetSessionStarted(true);
   Shell::GetInstance()->UpdateAfterLoginStatusChange(user::LOGGED_IN_USER);
   EXPECT_TRUE(GetTray()->visible());
   Shell::GetInstance()->EnableMaximizeModeWindowManager(false);
 }
 
 }  // namespace ash