Rename the aura_shell namespace to ash

ash/launcher/view_model_unittest.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/view_model.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/views/view.h"
 
-namespace aura_shell {
+namespace ash {
 
 TEST(ViewModel, BasicAssertions) {
   views::View v1;
   ViewModel model;
   model.Add(&v1, 0);
   EXPECT_EQ(1, model.view_size());
   EXPECT_EQ(&v1, model.view_at(0));
   gfx::Rect v1_bounds(1, 2, 3, 4);
   model.set_ideal_bounds(0, v1_bounds);
   EXPECT_EQ(v1_bounds, model.ideal_bounds(0));
@@ skipping 10 matching lines @@
   EXPECT_EQ(&v1, model.view_at(2));
   EXPECT_EQ(&v2, model.view_at(0));
   EXPECT_EQ(&v3, model.view_at(1));
 
   model.Move(2, 0);
   EXPECT_EQ(&v1, model.view_at(0));
   EXPECT_EQ(&v2, model.view_at(1));
   EXPECT_EQ(&v3, model.view_at(2));
 }
 
-}  // namespace aura_shell
+}  // namespace ash