Adding a dialog which explains that the multi user session has ended because a user policy has chan…

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="pp_ifdef('chromeos')">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 4694 matching lines @@
   </message>
   <message name="IDS_PLATFORM_VERIFICATION_DIALOG_DENY" desc="The button label to deny access of HD playback.">
     Disable on <ph name="DOMAIN">$1<ex>example.com</ex></ph>
   </message>
 
   <!-- Multi-profiles mode -->
   <message name="IDS_MULTIPROFILES_INTRO_HEADLINE" desc="Describes which feature multi-profiles intro dialog presents.">
     Multiple sign-in
   </message>
   <message name="IDS_MULTIPROFILES_INTRO_MESSAGE" desc="Content of the multi-profiles intro dialog shown when the user adds another user in multi-profiles mode.">
-     This feature allows you to access quickly any signed-in user without requiring a password.
+    This feature allows you to access quickly any signed-in user without requiring a password.
   </message>
   <message name="IDS_MULTIPROFILES_INTRO_EXPLANATION" desc="Content of the multi-profiles intro dialog shown when the user adds another user in multi-profiles mode.">
     Only use this feature with accounts you trust.
   </message>
   <message name="IDS_MULTIPROFILES_INTRO_NOSHOW_AGAIN" desc="In multi-profiles intro dialog, text for no-show-again option.">
     Got it, don't show me this again.
   </message>
+  <message name="IDS_MULTIPROFILES_SESSION_ABORT_HEADLINE" desc="Describes that the current multi profile session ends because one user left.">
+    Multiple sign-in has been disallowed for a user in this session
+  </message>
+  <message name="IDS_MULTIPROFILES_SESSION_ABORT_MESSAGE" desc="Content of the description that the current multi profile session ended because one user left.">
+    An administrator has disallowed multiple sign-in for <ph name="USER_EMAIL">$1<ex>john@google.com</ex></ph>.
+All users must sign out to continue.
+  </message>
+  <message name="IDS_MULTIPROFILES_SESSION_ABORT_BUTTON_LABEL" desc="Button label for the button in the multi profile session ended because one user left dialog.">
+    Sign out
+  </message>
 
   <!-- First-run tutorial -->
   <message name="IDS_FIRST_RUN_GREETING_STEP_HEADER" desc="Greeting message shown as header of the first dialog of first-run tutorial.">
     Howdy, <ph name="USER_GIVEN_NAME">$1<ex>John</ex></ph>.
   </message>
   <message name="IDS_FIRST_RUN_GREETING_STEP_HEADER_GENERAL" desc="Greeting message shown as header of the first dialog of first-run tutorial in case when we don't know user's given name.">
     Howdy.
   </message>
   <message name="IDS_FIRST_RUN_GREETING_STEP_TEXT_1" desc="First part of message shown on the first dialog of firsr-run tutorial.">
     Welcome to the Chromebook family. This is no ordinary computer.
@@ skipping 168 matching lines @@
   <message name="IDS_CHARGER_REPLACEMENT_DIALOG_TITLE" desc="Title of the charger replacement UI dialg">
     Check charger
   </message>
   <message name="IDS_FLAGS_ENABLE_SYSTEM_SOUNDS_NAME" desc="Name of the flag to enable system sounds independently from ChromeVox.">
     Enable system sounds
   </message>
   <message name="IDS_FLAGS_ENABLE_SYSTEM_SOUNDS_DESCRIPTION" desc="Description of the flag to enable system sounds independently from ChromeVox.">
     System sounds will be played independently from ChromeVox.
   </message>
 </grit-part>