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

chrome/browser/ui/webui/help/help_handler.cc

 // 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.
 
 #include "chrome/browser/ui/webui/help/help_handler.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 672 matching lines @@
         base::FundamentalValue(false));
   }
 #endif  // defined(OS_CHROMEOS)
 }
 
 #if defined(OS_MACOSX)
 void HelpHandler::SetPromotionState(VersionUpdater::PromotionState state) {
   std::string state_str;
   switch (state) {
   case VersionUpdater::PROMOTE_HIDDEN:
+  case VersionUpdater::PROMOTED:
     state_str = "hidden";
     break;
   case VersionUpdater::PROMOTE_ENABLED:
     state_str = "enabled";
     break;
   case VersionUpdater::PROMOTE_DISABLED:
     state_str = "disabled";
     break;
   }
 
@@ skipping 68 matching lines @@
         base::StringValue(""));
   } else {
     base::string16 message = GetEolMessage(status);
     web_ui()->CallJavascriptFunctionUnsafe(
         "help.HelpPage.updateEolMessage", base::StringValue("device_endoflife"),
         base::StringValue(message));
   }
 }
 
 #endif  // defined(OS_CHROMEOS)