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 657 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>
+
       <!-- "Create application shortcuts" dialog -->
       <if expr="is_posix and not is_macosx and not is_ios">
         <message name="IDS_CREATE_SHORTCUTS_ERROR_LABEL" desc="Contents of the main label in the error dialog box when creating an application shortcut failed for unknown reasons.">
           Chromium could not create an application shortcut.
         </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.
@@ skipping 489 matching lines @@
       </message>
       <message name="IDS_EXTENSIONS_SETTINGS_API_SECOND_LINE_START_PAGES" desc="Second line in the Settings API bubble. Only shown if the secondary change by the extension was just the start pages. The triple single quotes are needed to preserve the space before and after the sentence which is needed when the language (Chrome is being translated to) uses space as word separator. Please preserve them, unless the language being translated to does not use space as word separator.">
         ''' It also controls what page is shown when you start Chromium. '''
       </message>
       <message name="IDS_EXTENSIONS_SETTINGS_API_SECOND_LINE_START_AND_HOME" desc="Second line in the Settings API bubble. Only shown if the secondary change by the extension was both the start page and the home page. See IDS_EXTENSIONS_SETTINGS_API_SECOND_LINE_START_PAGES for reason for triple quotes.">
         ''' It also controls what page is shown when you start Chromium or click the Home button. '''
       </message>
       <message name="IDS_EXTENSIONS_SETTINGS_API_SECOND_LINE_START_AND_SEARCH" desc="Second line in the Settings API bubble. Only shown if the secondary change by the extension was both the start page and the search engine. See IDS_EXTENSIONS_SETTINGS_API_SECOND_LINE_START_PAGES for reason for triple quotes.">
         ''' It also controls what page is shown when you start Chromium or search from the Omnibox. '''
       </message>
-      
+
       <!-- Update bubble -->
       <message name="IDS_REINSTALL_APP" desc="Text for the button the user clicks to reinstall the app.">
         Reinstall Chromium
       </message>
       <if expr="use_titlecase">
         <message name="IDS_UPGRADE_BUBBLE_MENU_ITEM" desc="In Title Case: Text for the Chrome menu option replacing Update required.">
           Chromium is Out of Date
         </message>
       </if>
       <if expr="not use_titlecase">
@@ skipping 16 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>