Block NPAPI plug-ins in Metro mode instead of not loading them at all.

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.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 6520 matching lines @@
       <!-- Plug-in placeholders -->
       <message name="IDS_PLUGIN_LOAD" desc="The link for loading a blocked plug-in, displayed in the click to play UI.">
         Click to run <ph name="PLUGIN_NAME">$1<ex>Flash</ex></ph>.
       </message>
       <message name="IDS_PLUGIN_HIDE" desc="The tooltip for hiding a blocked plug-in, displayed in the click to play UI.">
         Hide this plug-in
       </message>
       <message name="IDS_PLUGIN_UPDATE" desc="The link for updating an outdated plug-in.">
         Update plug-in...
       </message>
+      <message name="IDS_PLUGIN_NOT_SUPPORTED" desc="The placeholder text for a plug-in that can't run in Windows Metro mode.">
+        <ph name="PLUGIN_NAME">$1<ex>Flash</ex></ph> requires Desktop mode.
+      </message>
       <message name="IDS_PLUGIN_BLOCKED" desc="The placeholder text for a blocked plug-in.">
         <ph name="PLUGIN_NAME">$1<ex>Flash</ex></ph> is not allowed.
       </message>
       <message name="IDS_NACL_PLUGIN_BLOCKED" desc="The placeholder text for a blocked plug-in.">
         This app is not currently supported on this device but the Chrome gnomes are hard at work to make it work soon.
       </message>
       <message name="IDS_PLUGIN_OUTDATED" desc="The placeholder text for an outdated plug-in.">
         <ph name="PLUGIN_NAME">$1<ex>Flash</ex></ph> is out of date.
       </message>
       <message name="IDS_PLUGIN_NOT_AUTHORIZED" desc="The placeholder text for a plug-in that requires user permission to run.">
@@ skipping 8193 matching lines @@
 
     <structures fallback_to_english="true">
       <!-- Make sure these stay in sync with the structures in generated_resources.grd. -->
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
   </release>
 </grit>