Eliminate ash::internal namespace

ash/shelf/shelf_window_watcher.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/shelf/shelf_window_watcher.h"
 
 #include "ash/ash_switches.h"
 #include "ash/display/display_controller.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/shelf_item_delegate_manager.h"
@@ skipping 32 matching lines @@
 }
 
 // Returns true if |window| is in the process of being dragged.
 bool IsDragging(aura::Window* window) {
   return ash::wm::GetWindowState(window)->is_dragged();
 }
 
 }  // namespace
 
 namespace ash {
-namespace internal {
 
 ShelfWindowWatcher::RootWindowObserver::RootWindowObserver(
     ShelfWindowWatcher* window_watcher)
     : window_watcher_(window_watcher) {
 }
 
 ShelfWindowWatcher::RootWindowObserver::~RootWindowObserver() {
 }
 
 void ShelfWindowWatcher::RootWindowObserver::OnWindowDestroying(
@@ skipping 218 matching lines @@
     OnRootWindowAdded(root_window);
 }
 
 void ShelfWindowWatcher::OnDisplayRemoved(const gfx::Display& old_display) {
   // When this is called, RootWindow of |old_display| is already removed.
   // Instead, we remove an observer from RootWindow and ActivationClient in the
   // OnRootWindowDestroyed().
   // Do nothing here.
 }
 
-}  // namespace internal
 }  // namespace ash