chromeos: Move files in //ash/common to //ash, part 2

ash/mus/test/ash_test_impl_mus.h

 // Copyright 2016 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_MUS_TEST_ASH_TEST_IMPL_MUS_H_
 #define ASH_MUS_TEST_ASH_TEST_IMPL_MUS_H_
 
-#include "ash/common/test/ash_test_impl.h"
 #include "ash/mus/test/wm_test_base.h"
+#include "ash/test/ash_test_impl.h"
 #include "base/macros.h"
 
 namespace ash {
 namespace mus {
 
 class WmTestBase;
 
 // Implementation of AshTestImpl for mus.
 class AshTestImplMus : public AshTestImpl {
  public:
@@ skipping 25 matching lines @@
   // of WmTestBase.
   std::unique_ptr<WmTestBase> wm_test_base_;
 
   DISALLOW_COPY_AND_ASSIGN(AshTestImplMus);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_TEST_ASH_TEST_IMPL_MUS_H_