Remove #pragma once from content

content/browser/accessibility/browser_accessibility_mac.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_MAC_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MAC_H_
-#pragma once
 
 #include <map>
 #include <utility>
 #include <vector>
 
 #include "base/memory/scoped_nsobject.h"
 #include "content/browser/accessibility/browser_accessibility.h"
 
 @class BrowserAccessibilityCocoa;
 
@@ skipping 20 matching lines @@
 
   // Allows access to the BrowserAccessibilityCocoa which wraps this.
   // BrowserAccessibility.
   // We own this object until our manager calls ReleaseReference;
   // thereafter, the cocoa object owns us.
   BrowserAccessibilityCocoa* browser_accessibility_cocoa_;
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityMac);
 };
 
 #endif // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MAC_H_