Removing implementation of unnecessary APIs taken out of the support lib.

1. We have hidden a framework API and it was take out of the
   support lib. This API is not necessary and this patch removes
   the implementation in LatinIME.

bug:6675330

Change-Id: I18aff7a6c7bc2b76c7332abe0bf294fbbb99ccfc

java/src/com/android/inputmethod/accessibility/AccessibilityEntityProvider.java

@@ -275,11 +275,6 @@ public class AccessibilityEntityProvider extends AccessibilityNodeProviderCompat
         return false;
     }
 
-    @Override
-    public AccessibilityNodeInfoCompat findAccessibilityFocus(int virtualViewId) {
-        return createAccessibilityNodeInfo(mAccessibilityFocusedView);
-    }
-
     /**
      * Sends an accessibility event for the given {@link Key}.
      *