Remove #pragma once from content

content/browser/accessibility/browser_accessibility_state_impl.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 CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_STATE_IMPL_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_STATE_IMPL_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/timer.h"
 #include "content/public/browser/browser_accessibility_state.h"
 
 // The BrowserAccessibilityState class is used to determine if Chrome should be
 // customized for users with assistive technology, such as screen readers. We
 // modify the behavior of certain user interfaces to provide a better experience
 // for screen reader users. The way we detect a screen reader program is
@@ skipping 32 matching lines @@
   // Set to true when full accessibility features should be enabled.
   bool accessibility_enabled_;
 
   // Timer to update the histogram a short while after startup.
   base::OneShotTimer<BrowserAccessibilityStateImpl> update_histogram_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityStateImpl);
 };
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_STATE_IMPL_H_