Add device disabling to OOBE flow

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="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 5058 matching lines @@
   </message>
   <message name="IDS_LOGIN_GUEST_SIGNIN_FIX_NETWORK">
     You may also try to <ph name="GUEST_SIGNIN_LINK_START">$1<ex>&gt;a&lt;</ex></ph>browse as guest<ph name="GUEST_SIGNIN_LINK_END">$2<ex>&gt;/a&lt;</ex></ph> to fix this network error.
   </message>
   <message name="IDS_LOGIN_CONNECTING_INDICATOR_TEXT" desc="A message to show telling the user that the device is attempting to re-connect to the network.">
     Connecting and verifying<ph name="ANIMATED_ELLIPSIS">$1<ex>...</ex></ph>
   </message>
   <message name="IDS_DEVICE_DISABLED_HEADING" desc="Heading of the message shown to the user when the device has been disabled by its owner.">
     Locked
   </message>
-  <message name="IDS_DEVICE_DISABLED_DEFAULT_MESSAGE" desc="Messsage shown to the user when the device has been disabled by its owner.">
-    Please return this device to its owner.
-  </message>
   <message name="IDS_DEVICE_DISABLED_EXPLANATION" desc="Explanation shown to the user when the device has been disabled by its owner.">
     This device was locked by its owner. Only an approved administrator can unlock it. Take this device to Tech Support for assistance.
   </message>
 
   <!-- Idle warning dialog -->
   <message name="IDS_IDLE_WARNING_TITLE" desc="Title of the warning dialog shown when the user becomes idle and is about to get logged out.">
     Are you still there?
   </message>
   <message name="IDS_IDLE_WARNING_LOGOUT_WARNING" desc="Content of the warning dialog shown when the user becomes idle and is about to get logged out.">
     If you keep doing nothing, you will be signed out in <ph name="LOGOUT_TIME_LEFT">$1<ex>5 seconds</ex></ph>.
@@ skipping 859 matching lines @@
   <message name="IDS_SET_TIME_BUTTON_CLOSE" desc="Text for the button to close the window.">
     Done
   </message>
   <message name="IDS_SET_TIME_DATE_LABEL" desc="Label for the date input element.">
     System date
   </message>
   <message name="IDS_SET_TIME_TIME_LABEL" desc="Label for the time input element.">
     System time
   </message>
 </grit-part>