Eliminate ash::internal namespace

ash/wm/mru_window_tracker.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/wm/mru_window_tracker.h"
 
 #include <algorithm>
 
 #include "ash/session_state_delegate.h"
 #include "ash/shell.h"
@@ skipping 17 matching lines @@
                        int container_id,
                        MruWindowTracker::WindowList* windows) {
   aura::Window* container = Shell::GetContainer(root, container_id);
   const MruWindowTracker::WindowList& children(container->children());
   windows->insert(windows->end(), children.begin(), children.end());
 }
 
 // Adds windows being dragged in the docked container to |windows| list.
 void AddDraggedWindows(aura::Window* root,
                        MruWindowTracker::WindowList* windows) {
-  aura::Window* container = Shell::GetContainer(
-      root, internal::kShellWindowId_DockedContainer);
+  aura::Window* container =
+      Shell::GetContainer(root, kShellWindowId_DockedContainer);
   const MruWindowTracker::WindowList& children = container->children();
   for (MruWindowTracker::WindowList::const_iterator iter = children.begin();
        iter != children.end(); ++iter) {
     if (wm::GetWindowState(*iter)->is_dragged())
       windows->insert(windows->end(), *iter);
   }
 }
 
 // Returns whether |w1| should be considered less recently used than |w2|. This
 // is used for a stable sort to move minimized windows to the LRU end of the
@@ skipping 140 matching lines @@
 
 void MruWindowTracker::OnWindowDestroyed(aura::Window* window) {
   // It's possible for OnWindowActivated() to be called after
   // OnWindowDestroying(). This means we need to override OnWindowDestroyed()
   // else we may end up with a deleted window in |mru_windows_|.
   mru_windows_.remove(window);
   window->RemoveObserver(this);
 }
 
 }  // namespace ash