Remove #pragma once from content

content/public/browser/render_widget_host_view_mac_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 CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_VIEW_MAC_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_VIEW_MAC_DELEGATE_H_
-#pragma once
 
 #import <Cocoa/Cocoa.h>
 
 // This protocol is used as a delegate for the NSView class used in the
 // hierarchy. There are two ways to extend the view:
 // - Implement the methods listed in the protocol below.
 // - Implement any method, and if the view is requested to perform that method
 //   and cannot, the delegate's implementation will be used.
 //
 // Like any Objective-C delegate, it is not retained by the delegator object.
@@ skipping 20 matching lines @@
 
 // Provides validation of user interface items. If the return value is NO, then
 // the delegate is unaware of that item and |valid| is undefined.  Otherwise,
 // |valid| contains the validity of the specified item.
 - (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)item
                       isValidItem:(BOOL*)valid;
 
 @end
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_VIEW_MAC_DELEGATE_H_