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

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- About Page -->
   <message name="IDS_SETTINGS_ABOUT_PAGE_BROWSER_VERSION" desc="The text label describing the version of the browser, example: Version 57.0.2937.0 (Developer Build) unknown (64-bit)">
     Version <ph name="PRODUCT_VERSION">$1<ex>15.0.865.0</ex></ph> (<ph name="PRODUCT_CHANNEL">$2<ex>Developer Build</ex></ph>) <ph name="PRODUCT_MODIFIER">$3</ph> <ph name="PRODUCT_VERSION_BITS">$4</ph>
   </message>
   <if expr="chromeos">
     <message name="IDS_SETTINGS_ABOUT_PAGE_DETAILED_BUILD_INFO" desc="Label describing the section that shows detailed information about the current Chrome build.">
       Detailed build information
@@ skipping 91 matching lines @@
     </message>
   </if>
   <if expr="_google_chrome">
     <message name="IDS_SETTINGS_ABOUT_PAGE_REPORT_AN_ISSUE" desc="Text of the button which allows the user to report an issue with Chrome.">
       Report an issue
     </message>
   </if>
   <message name="IDS_SETTINGS_ABOUT_UPGRADE_CHECK_STARTED" desc="Status label: About to start checking for updates">
     Checking for updates
   </message>
+  <if expr="is_macosx">
+    <message name="IDS_ABOUT_CHROME_AUTOUPDATE_ALL" desc="The 'Automatically update Chrome for all users.' button in the About window.  Mac-only.">
+      Automatically update Chrome for all users.
+    </message>
+    <message name="IDS_ABOUT_CHROME_AUTOUPDATE_ALL_IS_ON" desc="The text in About Page to indicate automatic update is turned on.  Mac-only.">
+      Automatic updates are turned on.
+    </message>
+  </if>
 
   <!-- Accessibility Page -->
   <message name="IDS_SETTINGS_ACCESSIBILITY" desc="Name of the settings page which displays accessibility preferences.">
     Accessibility
   </message>
   <message name="IDS_SETTINGS_ACCESSIBILITY_WEB_STORE" desc="Text for an external link explaining that additional accessibility features are found on the Chrome Web Store.">
     Choose from the Chrome Web Store
   </message>
   <message name="IDS_SETTINGS_MORE_FEATURES_LINK" desc="Link which opens page where users can install extensions which provide additional accessibility features.">
     Add accessibility features
@@ skipping 2610 matching lines @@
       System
     </message>
     <message name="IDS_SETTINGS_SYSTEM_HARDWARE_ACCELERATION_LABEL" desc="Label for the checkbox that forces Chrome to render via hardware acceleration (GPU) when available.">
       Use hardware acceleration when available
     </message>
     <message name="IDS_SETTINGS_SYSTEM_PROXY_SETTINGS_BUTTON" desc="Text for the button that changes a user's network proxy settings.">
       Change proxy settings
     </message>
   </if>
 </grit-part>