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

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 2de6bccb54d7004bd13d2cc93912a07557a07832..b3c6c311c1c0bfafa569644ae5e78c08d4b5f261 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -7496,12 +7496,22 @@ Keep your key file in a safe place. You will need it to create new versions of y
     <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 is woefully out of date because it hasn't crashed or restarted in a while.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'">