Add link to Settings page to add accessibility extensions.

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 1808 matching lines @@
   </message>
   <message name="IDS_OPTIONS_SETTINGS_SECTION_TITLE_SCREEN" desc="Title for section in settings/system for screen brightness control">
     Screen
   </message>
   <message name="IDS_OPTIONS_SETTINGS_SECTION_TITLE_BLUETOOTH">
     Bluetooth
   </message>
   <message name="IDS_OPTIONS_SETTINGS_SECTION_TITLE_LANGUAGE">
     Language
   </message>
-  <message name="IDS_OPTIONS_SETTINGS_SECTION_TITLE_ACCESSIBILITY">
-    Accessibility
-  </message>
   <message name="IDS_OPTIONS_SETTINGS_BATTERY_DESCRIPTION" desc="The 'Battery' button on the chrome://settings page.">
     Battery...
   </message>
   <message name="IDS_OPTIONS_SETTINGS_STORAGE_DESCRIPTION" desc="The 'Storage' button on the chrome://settings page.">
     Stored data...
   </message>
   <message name="IDS_OPTIONS_SETTINGS_TIME_SYNCED_EXPLANATION" desc="In the settings tab, the text indicating that the date and time are set automatically.">
     Date and time are set automatically.
   </message>
   <message name="IDS_OPTIONS_SETTINGS_SET_TIME_BUTTON" desc="In the settings tab, the prompt on the button to open a dialog to set date and time.">
@@ skipping 3985 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>