Revert of Multiprofile security: Show a warning messagebox when desktop casting/sharing is turned on upon user

ash/ash_chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from ash_strings.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
 
   <!-- Status tray charging strings. -->
   <message name="IDS_ASH_STATUS_TRAY_LOW_POWER_CHARGER_TITLE" desc="The title of a notification indicating that a low-current USB charger has been connected.">
     Low-power charger connected
   </message>
   <message name="IDS_ASH_STATUS_TRAY_LOW_POWER_CHARGER_MESSAGE" desc="The message body of a notification indicating that a low-current USB charger has been connected.">
@@ skipping 116 matching lines @@
   <message name="IDS_NETWORK_CELLULAR_ACTIVATED" desc="Text of the cellular activated notification">
     Congratulations! Your '<ph name="name">$1<ex>Generic Wireless</ex></ph>' data service has been activated and is ready to go.
   </message>
   <message name="IDS_NETWORK_ACTIVATION_ERROR_TITLE" desc="Title for network activation error notification">
     Network Activation Error
   </message>
   <message name="IDS_NETWORK_ACTIVATION_NEEDS_CONNECTION" desc="Message when attempting to activate a mobile network that requires a connection">
     Activation of '<ph name="name">$1<ex>Generic Wireless</ex></ph>' requires a network connection.
   </message>
 
-  <!-- Ash multi-user warning dialog -->
-  <message name="IDS_DESKTOP_CASTING_ACTIVE_TITLE" desc="The title for the dialog which tells the user that desktop casting is in progress, asking if the casting should be stopped before switching - or - the switch should be aborted.">
-    Stop screen sharing?
-  </message>
-  <message name="IDS_DESKTOP_CASTING_ACTIVE_MESSAGE" desc="The message for the dialog which tells the user that desktop casting is in progress, asking if the casting should be stopped before switching - or - the switch should be aborted.">
-    Screen sharing will stop when you switch to another user. Do you want to continue?
-  </message>
-  <message name="IDS_DESKTOP_CASTING_ACTIVE_BUTTON_SWITCH_USER" desc="The button label for the dialog which tells the user that desktop casting is in progress. By selecting this button the casting will be stopped and the user will get switched.">
-    Yes
-  </message>
-  <message name="IDS_DESKTOP_CASTING_ACTIVE_BUTTON_ABORT_USER_SWITCH" desc="The button label for the dialog which tells the user that desktop casting is in progress. By selecting this button the user switch will be cancelled.">
-    No
-  </message>
-
   <!-- Network error strings -->
   <message name="IDS_CHROMEOS_NETWORK_ERROR_UNKNOWN" desc="Network error details in notifications: UNKNOWN">
     Unknown network error
   </message>
   <message name="IDS_CHROMEOS_NETWORK_ERROR_OUT_OF_RANGE" desc="Network error details in notifications: OUT_OF_RANGE">
     Out of range
   </message>
   <message name="IDS_CHROMEOS_NETWORK_ERROR_PIN_MISSING" desc="Network error details in notifications: PIN_MISSING">
     PIN missing
   </message>
@@ skipping 340 matching lines @@
   <message name="IDS_ASH_LOGOUT_CONFIRMATION_WARNING" desc="The text for the logout confirmation dialog.">
     You will automatically be signed out in <ph name="LOGOUT_TIME_LEFT">$1<ex>5 seconds</ex></ph>.
   </message>
   <message name="IDS_ASH_LOGOUT_CONFIRMATION_WARNING_NOW" desc="The text for the logout confirmation dialog with no time left.">
     You will be signed out now.
   </message>
   <message name="IDS_ASH_LOGOUT_CONFIRMATION_BUTTON" desc="The text for okay button of the logout confirmation dialog.">
     Sign out now
   </message>
 </grit-part>