Remove DisplayChangeObserver ash dependencies.

ui/strings/ui_strings.grd

Index: ui/strings/ui_strings.grd
diff --git a/ui/strings/ui_strings.grd b/ui/strings/ui_strings.grd
index f382e72d2c71ff7c0d288f5debdd0e58fd3ed813..2d7ed3100b336b433b9b60e7815eeb8625fe1ffb 100644
--- a/ui/strings/ui_strings.grd
+++ b/ui/strings/ui_strings.grd
@@ -633,6 +633,17 @@ need to be translated for each locale.-->
       <message name="IDS_APP_LIST_SPEECH_NETWORK_ERROR_HINT_TEXT" desc="The text label in the speech recognition UI to show the speech recognition can't start because of network error.">
         No internet connection
       </message>
+      
+      <!-- Display names -->
+      <message name="IDS_DISPLAY_NAME_UNKNOWN" desc="The name used for a display whose name is unknown, which is shown in the display settings and ash tray.">
+        Unknown Display
+      </message>
+      <message name="IDS_DISPLAY_NAME_INTERNAL" desc="The name used for internal displays, which is shown in the display settings.">
+        Internal Display
+      </message>
+      <message name="IDS_DISPLAY_NAME_VIRTUAL" 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>
     </messages>
   </release>
 </grit>