Rename the aura_shell namespace to ash

ash/launcher/launcher_model.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/launcher/launcher_model.h"
 
 #include "ui/aura/window.h"
 #include "ash/launcher/launcher_model_observer.h"
 
-namespace aura_shell {
+namespace ash {
 
 LauncherModel::LauncherModel() {
 }
 
 LauncherModel::~LauncherModel() {
 }
 
 void LauncherModel::Add(int index, const LauncherItem& item) {
   DCHECK(index >= 0 && index <= item_count());
   items_.insert(items_.begin() + index, item);
@@ skipping 56 matching lines @@
 }
 
 void LauncherModel::AddObserver(LauncherModelObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void LauncherModel::RemoveObserver(LauncherModelObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
-}  // namespace aura_shell
+}  // namespace ash