Remove pre-MD code related to tray/menu user profiles.

ash/ash_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains the strings for ash.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/ash_strings.h" type="rc_header">
@@ skipping 189 matching lines @@
       </message>
       <message name="IDS_ASH_STATUS_TRAY_PUBLIC_LABEL" desc="Text of the the ash system bubble's user card when the current session is a public account session.">
         <ph name="DISPLAY_NAME">$1<ex>Internet kiosk</ex></ph> is a public session managed by <ph name="DOMAIN">$2<ex>yourdomain.com</ex></ph>
       </message>
       <message name="IDS_ASH_STATUS_TRAY_LOCK" desc="The label used for the button in the status tray to lock the screen.">
         Lock
       </message>
       <message name="IDS_ASH_STATUS_TRAY_SIGN_IN_ANOTHER_ACCOUNT" desc="The string for the button which lets the user add another account to the current session.">
         Sign in another user...
       </message>
-      <message name="IDS_ASH_STATUS_TRAY_CAPTION_CANNOT_ADD_USER" desc="The caption for the error message when the user has reached the limit of multi profile users.">
-        Can't sign in to another account.
-      </message>
       <message name="IDS_ASH_STATUS_TRAY_MESSAGE_CANNOT_ADD_USER" desc="The error message when the user has reached the limit of multi profile users.">
         You can only have up to three accounts in multiple sign-in.
       </message>
       <message name="IDS_ASH_STATUS_TRAY_MESSAGE_NOT_ALLOWED_PRIMARY_USER" desc="The error message when the primary user forbids multiple signin because of not-allowed policy or because of usage policy-pushed certificates.">
         The administrator for this account has disallowed multiple sign-in.
       </message>
       <message name="IDS_ASH_STATUS_TRAY_MESSAGE_OUT_OF_USERS" desc="The error message when all the users are added into multi-profile session.">
         All available users have already been added to this session.
       </message>
 
@@ skipping 224 matching lines @@
 
       <!-- ChromeOS-specific strings -->
       <if expr="chromeos">
         <part file="ash_chromeos_strings.grdp" />
       </if>
 
     </messages>
   </release>
 </grit>