Remove DisplayChangeObserver ash dependencies.

ash/ash_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains the strings for ash.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/ash_strings.h" type="rc_header">
@@ skipping 267 matching lines @@
         Restart and powerwash to update
       </message>
 
       <message name="IDS_ASH_STATUS_TRAY_VOLUME" desc="The accessible text for the volume slider.">
         Volume
       </message>
       <message name="IDS_ASH_STATUS_TRAY_VOLUME_MUTE" desc="The accessible text for the volume mute button.">
         Mute
       </message>
 
-      <message name="IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME" desc="Label shown in tray for a display whose name is unknown.">
-        Unknown Display
-      </message>
       <message name="IDS_ASH_STATUS_TRAY_DRIVE" desc="The label used for Google Drive tray details header.">
         Google Drive
       </message>
       <message name="IDS_ASH_STATUS_TRAY_DRIVE_SETTINGS" desc="The label used for Google Drive settings entry.">
         Google Drive settings...
       </message>
       <message name="IDS_ASH_STATUS_TRAY_IME" desc="The label used as the header in the IME popup.">
         Input methods
       </message>
       <message name="IDS_ASH_STATUS_TRAY_IME_SETTINGS" desc="The label used for IME settings entry.">
@@ skipping 94 matching lines @@
         Stylus tools
       </message>
 
       <message name="IDS_ASH_TOAST_DISMISS_BUTTON" desc="The text button shown in toasts to close the toast immediately without waiting timeout.">
         DISMISS
       </message>
 
       <message name="IDS_ASH_NOTIFICATION_UNREAD_COUNT_NINE_PLUS" desc="The text shown in the notification icon for the unread count when the count is more than 9.">
         9+
       </message>
-      <message name="IDS_ASH_INTERNAL_DISPLAY_NAME" desc="The name used for internal displays, which is shown in the display settings.">
-        Internal Display
-      </message>
-      <message name="IDS_ASH_VIRTUAL_DISPLAY_NAME" desc="The name used for virtual displays, which is shown in the display settings. Virtual displays are not associated with a physical monitor.">
-        Virtual Display
-      </message>
       <message name="IDS_ASH_EXIT_WARNING_POPUP_TEXT" desc="The text of the popup when the user preses the exit shortcut.">
         Press Ctrl+Shift+Q twice to quit.
       </message>
       <message name="IDS_ASH_EXIT_WARNING_POPUP_TEXT_ACCESSIBLE" desc="The message used by accessibility to indicate the content of the popup when the user preses the exit shortcut.">
         Press Control Shift Q twice to quit.
       </message>
 
       <message name="IDS_ASH_CONTROL_KEY" desc="Name of [Ctrl] key name. Shouldn't be translated in many languages actually. This name should be lower case.">
         ctrl
       </message>
@@ skipping 23 matching lines @@
 
       <!-- ChromeOS-specific strings -->
       <if expr="chromeos">
         <part file="ash_chromeos_strings.grdp" />
       </if>
 
     </messages>
   </release>
 </grit>