Eliminate ash::internal namespace

chrome/browser/ui/ash/multi_user/multi_user_window_manager_chromeos.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 "chrome/browser/ui/ash/multi_user/multi_user_window_manager_chromeos.h"
 
 #include "apps/app_window.h"
 #include "apps/app_window_registry.h"
 #include "ash/ash_switches.h"
 #include "ash/desktop_background/user_wallpaper_delegate.h"
@@ skipping 718 matching lines @@
     return;
 
   // Hiding a system modal dialog should not be allowed. Instead we switch to
   // the user which is showing the system modal window.
   // Note that in some cases (e.g. unit test) windows might not have a root
   // window.
   if (!visible && window->GetRootWindow()) {
     // Get the system modal container for the window's root window.
     aura::Window* system_modal_container =
         window->GetRootWindow()->GetChildById(
-            ash::internal::kShellWindowId_SystemModalContainer);
+            ash::kShellWindowId_SystemModalContainer);
     if (window->parent() == system_modal_container) {
       // The window is system modal and we need to find the parent which owns
       // it so that we can switch to the desktop accordingly.
       std::string user_id = GetUserPresentingWindow(window);
       if (user_id.empty()) {
         aura::Window* owning_window = GetOwningWindowInTransientChain(window);
         DCHECK(owning_window);
         user_id = GetUserPresentingWindow(owning_window);
         DCHECK(!user_id.empty());
       }
@@ skipping 113 matching lines @@
     window->Show();
   else
     window->Hide();
 
   // Make sure that animations have no influence on the window state after the
   // call.
   DCHECK_EQ(visible, window->IsVisible());
 }
 
 }  // namespace chrome