Removed symbol causing compile breakage.

  Seems like this string was removed in
  https://googleplex-android-review.googlesource.com/#/c/247477

Change-Id: I2cc96143980d326cfdbc1db3b2a3c9766963ef03

Author: Baligh Uddin

core/res/res/values/symbols.xml

@@ -555,7 +555,6 @@
   <java-symbol type="string" name="keygaurd_accessibility_media_controls" />
   <java-symbol type="string" name="keyguard_accessibility_status" />
   <java-symbol type="string" name="keyguard_accessibility_user_selector" />
-  <java-symbol type="string" name="keyguard_accessibility_widget_changed" />
   <java-symbol type="string" name="kilobyteShort" />
   <java-symbol type="string" name="last_month" />
   <java-symbol type="string" name="launchBrowserDefault" />