Remove #pragma once from ash

ash/test/test_activation_delegate.h

 // Copyright (c) 2012 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_ACTIVATION_DELEGATE_H_
 #define ASH_TEST_TEST_ACTIVATION_DELEGATE_H_
-#pragma once
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "ui/aura/client/activation_delegate.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ash {
@@ skipping 32 matching lines @@
   int lost_active_count_;
   int should_activate_count_;
 
   DISALLOW_COPY_AND_ASSIGN(TestActivationDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_ACTIVATION_DELEGATE_H_