Add mac-only "Set Up Automatic Updates..." button to the new about page.

chrome/browser/mac/keystone_glue.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 CHROME_BROWSER_MAC_KEYSTONE_GLUE_H_
 #define CHROME_BROWSER_MAC_KEYSTONE_GLUE_H_
 
 #include "base/strings/string16.h"
 
 #if defined(__OBJC__)
@@ skipping 148 matching lines @@
 // will fail given the rights and permissions involved.  On the other hand,
 // when -needsPromotion is YES, the application can encourage the user to
 // promote the ticket so that updates will work properly.
 //
 // Use -wantsPromotion to decide whether to allow the user to promote.  The
 // user shouldn't be nagged about promotion on the basis of -wantsPromotion,
 // but if it's YES, the user should be allowed to promote the ticket.
 - (BOOL)needsPromotion;
 - (BOOL)wantsPromotion;
 
+// -isAutoupdateEnabledForAllUsers indicates whether or not autoupdate is
+// turned on for all users.
+- (BOOL)isAutoupdateEnabledForAllUsers;
+
 // Promotes the Keystone ticket into the system store.  System Keystone will
 // be installed if necessary.  If synchronous is NO, the promotion may occur
 // in the background.  synchronous should be YES for promotion during
 // installation. The KeystoneGlue object assumes ownership of
 // authorization_arg.
 - (void)promoteTicketWithAuthorization:(AuthorizationRef)authorization_arg
                            synchronous:(BOOL)synchronous;
 
 // Requests authorization and calls -promoteTicketWithAuthorization: in
 // asynchronous mode.
@@ skipping 42 matching lines @@
 
 // True if Keystone is enabled.
 bool KeystoneEnabled();
 
 // The version of the application currently installed on disk.
 base::string16 CurrentlyInstalledVersion();
 
 }  // namespace keystone_glue
 
 #endif  // CHROME_BROWSER_MAC_KEYSTONE_GLUE_H_