Added accessible title, icon-title and notification for factory reset screen.

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 1184 matching lines @@
   </message>
   <message name="IDS_KIOSK_ENABLE_SCREEN_ERROR" desc="Error text shown on kiosk enable screen after we failed enabling this feature.">
    An error occurred. Kiosk application will not be able to auto-launch on this device.
   </message>
   <message name="IDS_KIOSK_ENABLE_SCREEN_ENABLE_BUTTON" desc="Enable button text">
     Enable
   </message>
   <message name="IDS_RESET_SCREEN_TITLE" desc="Title of the reset screen">
     Factory reset
   </message>
+  <message name="IDS_RESET_SCREEN_ICON_TITLE" desc="Accessible title of the reset screen icon depicting exclamation mark.">
+    Exclamation mark icon
+  </message>
   <message name="IDS_UPDATE_SCREEN_TITLE" desc="Title of the OOBE update screen">
     Update
   </message>
   <message name="IDS_UPDATE_SCREEN_ACCESSIBLE_TITLE" desc="Title to be spoken on opening the OOBE update screen">
     Chrome updates automatically so you always have the freshest version
   </message>
   <message name="IDS_SIGNIN_SCREEN_TITLE" desc="Title of OOBE/Add User sign-in screen">
     Sign in
   </message>
   <message name="IDS_SIGNIN_SCREEN_PASSWORD_CHANGED" desc="Title of OOBE/Add User sign-in screen when password was changed">
@@ skipping 4219 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>