[Mac] Implement the update available notification in the wrench menu.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/generated_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 7478 matching lines @@
 
     <!-- Theme UI -->
     <message name="IDS_THEME_LOADING_TITLE" desc="The text to be displayed in a window while a theme is loading.">
       Loading...
     </message>
 
     <!-- Update Recommended dialog -->
     <message name="IDS_UPDATE_RECOMMENDED" desc="The main text of the Update Recommended dialog.">
       Old school's not cool. <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> is woefully out of date because it hasn't crashed or restarted in a while. Restart to apply update.
     </message>
-    <message name="IDS_RESTART_AND_UPDATE" desc="The button label for restarting and updating Chrome.">
-      Restart and update
-    </message>
-    <message name="IDS_NOT_NOW" desc="The button label for delaying the restart and updating Chrome.">
-      Not now
-    </message>
+    <if expr="not pp_ifdef('use_titlecase')">
+      <message name="IDS_RESTART_AND_UPDATE" desc="The button label for restarting and updating Chrome.">
+        Restart and update
+      </message>
+      <message name="IDS_NOT_NOW" desc="The button label for delaying the restart and updating Chrome.">
+        Not now
+      </message>
+    </if>
+    <if expr="pp_ifdef('use_titlecase')">
+      <message name="IDS_RESTART_AND_UPDATE" desc="In Tile Case: The button label for restarting and updating Chrome.">
+        Update and Restart
+      </message>
+      <message name="IDS_NOT_NOW" desc="In Tile Case: The button label for delaying the restart and updating Chrome.">
+        Not Now
+      </message>
+    </if>
 
     <!-- Extra Mac UI Strings -->
     <if expr="os == 'darwin'">
       <message name="IDS_PLEASE_RESTART_BROWSER" desc="Title of the alert when Chrome needs to be restart for a change/update to take effect.">
         Please Restart <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>
       </message>
       <message name="IDS_SAVE_PAGE_FILE_FORMAT_PROMPT_MAC" desc="The title of the File Format label for saving a page.">
         Format:
       </message>
 
@@ skipping 1250 matching lines @@
 
     </messages>
 
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>