More distinguishable message is spoken when accessibility is enabled/disabled on login screen.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 12254 matching lines @@
       <message name="IDS_CHROMEOS_ACC_PERIOD" desc="The name of the period character.">
         Period
       </message>
       <message name="IDS_CHROMEOS_ACC_SPACE" desc="The name of a space character.">
         Space
       </message>
       <message name="IDS_CHROMEOS_ACC_TEXT_UNSELECTED" desc="A phrase to indicate to the user that text has been unselected.">
         Unselected
       </message>
       <message name="IDS_CHROMEOS_ACC_ACCESS_ENABLED" desc="A phrase to speak when accessibility is enabled.">
-        Accessibility turned on.
+        Enabling spoken feedback.
       </message>
       <message name="IDS_CHROMEOS_ACC_ACCESS_DISABLED" desc="A phrase to speak when accessibility is disabled.">
-        Accessibility turned off.
+        Disabling spoken feedback.
       </message>
       <message name="IDS_CHROMEOS_ACC_USERNAME_LABEL" desc="Label for the username text field.">
         Username.
       </message>
       <message name="IDS_CHROMEOS_ACC_LOGIN_SIGNING_IN" desc="Status when signing in.">
         Signing in.
       </message>
       <message name="IDS_CHROMEOS_ACC_LOGIN_SIGNIN_OFFRECORD" desc="Status when signing in incognito.">
         Signing in guest mode.
       </message>
@@ skipping 1081 matching lines @@
     </includes>
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>