Rename the aura_shell namespace to ash

ash/test/test_suite.h

 // 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.
 
 #ifndef ASH_TEST_TEST_SUITE_H_
 #define ASH_TEST_TEST_SUITE_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/test/test_suite.h"
 
-namespace aura_shell {
+namespace ash {
 namespace test {
 
 class AuraShellTestSuite : public base::TestSuite {
  public:
   AuraShellTestSuite(int argc, char** argv);
 
  protected:
   // base::TestSuite:
   virtual void Initialize() OVERRIDE;
   virtual void Shutdown() OVERRIDE;
 };
 
 }  // namespace test
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // ASH_TEST_TEST_SUITE_H_