Show an InfoBar when trying to start Packaged Apps from Metro mode.

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 217 matching lines @@
           Chromium OS
         </message>
       </if>
       <if expr="is_win">
         <message name="IDS_PRODUCT_FRAME_NAME" desc="The Chrome Frame application name">
           Chromium Frame
         </message>
         <message name="IDS_PRODUCT_APP_LAUNCHER_NAME" desc="The Chrome App Launcher application name">
           Chromium App Launcher
         </message>
-        <message name="IDS_WIN8_INFOBAR_DESKTOP_RESTART_TO_LAUNCH_APPS"
-                 desc="Infobar message to restart chrome in desktop mode to launch Chrome Apps. Aplies to Windows 8 only">
+        <message name="IDS_WIN8_INFOBAR_DESKTOP_RESTART_FOR_APP_LIST"
+                 desc="Infobar message to restart chrome in desktop mode to display the App Launcher. Aplies to Windows 8 only">
           You need to switch Chromium to desktop mode to use the App Launcher.
         </message>
+        <message name="IDS_WIN8_INFOBAR_DESKTOP_RESTART_FOR_PACKAGED_APP"
+                 desc="Infobar message to restart chrome in desktop mode to launch a Chrome Packaged App. Aplies to Windows 8 only">
+          You need to switch Chromium to desktop mode to use Packaged Apps.
+        </message>
         <message name="IDS_PRODUCT_BINARIES_NAME" desc="The Chrome Binaries application name">
           Chromium Binaries
         </message>
         <message name="IDS_VERSIONMISMATCH_HEADER">
           Chromium Frame Update.
         </message>
         <message name="IDS_VERSIONMISMATCH">
           Chromium Frame has been updated. Please relaunch your browser. Chromium version: <ph name="TODO_0001">%ls<ex>TODO</ex></ph>, Chromium Frame version: <ph name="TODO_0002">%ls<ex>TODO</ex></ph>
         </message>
         <message name="IDS_VERSIONUNKNOWN">
@@ skipping 715 matching lines @@
 
       <!-- Chrome OS OOBE Terms of Service screen-->
       <if expr="pp_ifdef('chromeos')">
         <message name="IDS_TERMS_OF_SERVICE_SCREEN_SUBHEADING" desc="Subheading at the top of the Terms of Service screen.">
           <ph name="DOMAIN">$1<ex>example.com</ex></ph> requires that you read and accept the following Terms of Service before using this device. These terms do not expand, modify or limit the Chromium OS Terms.
         </message>
       </if>
     </messages>
   </release>
 </grit>