Rename the aura_shell namespace to ash

ash/wm/toplevel_layout_manager.cc

 // Copyright (c) 2011 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/toplevel_layout_manager.h"
 
 #include "ash/wm/shelf_layout_manager.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/gfx/screen.h"
 
-namespace aura_shell {
+namespace ash {
 namespace internal {
 
 ToplevelLayoutManager::ToplevelLayoutManager() : shelf_(NULL) {
 }
 
 ToplevelLayoutManager::~ToplevelLayoutManager() {
   for (Windows::const_iterator i = windows_.begin(); i != windows_.end(); ++i)
     (*i)->RemoveObserver(this);
 }
 
@@ skipping 42 matching lines @@
   }
 }
 
 void ToplevelLayoutManager::UpdateShelfVisibility() {
   if (!shelf_)
     return;
   shelf_->SetVisible(!HasFullscreenWindow(windows_));
 }
 
 }  // namespace internal
-}  // namespace aura_shell
+}  // namespace ash