Prevent Chrome from quitting when apps are open. (Mac)

chrome/app/chromium_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are distribution specific.
 These strings will not be translated and only english versions will
 be available for now. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/chromium_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 633 matching lines @@
       <message name="IDS_SINGLE_DOWNLOAD_REMOVE_CONFIRM_EXPLANATION" desc="Explanation of the dialog asking for user confirmation to close the browser when one download is in progress.">
         A download is currently in progress. Do you want to exit Chromium and cancel the download?
       </message>
       <message name="IDS_MULTIPLE_DOWNLOADS_REMOVE_CONFIRM_EXPLANATION" desc="Explanation of the dialog asking for user confirmation to close the browser when multiple downloads are in progress.">
         Downloads are currently in progress. Do you want to exit Chromium and cancel the downloads?
       </message>
       <message name="IDS_DOWNLOAD_REMOVE_CONFIRM_OK_BUTTON_LABEL" desc="Button text for OKing to close the browser when one or more downloads are in progress.">
         Yes, exit Chromium
       </message>
 
+      <!-- Quit all apps confirmation dialog -->
+      <if expr="is_macosx">
+        <message name="IDS_QUIT_WITH_APPS_TITLE" desc="Title for a notification explaining that Chrome is running in the background.">
+          Chromium is running in the background.
+        </message>
+      </if>
+
       <!-- Autolaunch infobar -->
       <message name="IDS_AUTO_LAUNCH_INFOBAR_TEXT" desc="The text to show in the infobar when Chromium was automatically launched on startup">
         Chromium is configured to automatically launch when you start your computer.
       </message>
 
       <!-- about:flags -->
       <if expr="not chromeos">
         <message name="IDS_FLAGS_RELAUNCH_NOTICE" desc="Notifies the user that he needs to relaunch Chromium. Shown next to a button that says 'Relaunch Now'.">
           Your changes will take effect the next time you relaunch Chromium.
         </message>
@@ skipping 533 matching lines @@
         <message name="IDS_NEW_TAB_OTR_EXTENSIONS_MESSAGE"
                  desc="Explanation in a new OTR window that extensions have been disabled while in OTR.">
           Because Chromium does not control how extensions handle your personal data, all extensions have been disabled for incognito windows. You can reenable them individually in the
           <ph name="BEGIN_LINK">&lt;a href="$1"&gt;</ph>extensions manager<ph name="END_LINK">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>.
         </message>
       </if>
 
     </messages>
   </release>
 </grit>