Fixing 'Item removed' announced twice when using accessible DnD

Change-Id: I2d8781155619d22a41c3f363be7909d411c62fa9
diff --git a/src/com/android/launcher3/ButtonDropTarget.java b/src/com/android/launcher3/ButtonDropTarget.java
index 9caa7ad..69688f3 100644
--- a/src/com/android/launcher3/ButtonDropTarget.java
+++ b/src/com/android/launcher3/ButtonDropTarget.java
@@ -303,14 +303,10 @@
         setOnClickListener(enable ? this : null);
     }
 
-    protected String getAccessibilityDropConfirmation() {
-        return null;
-    }
-
     @Override
     public void onClick(View v) {
         LauncherAppState.getInstance().getAccessibilityDelegate()
-            .handleAccessibleDrop(this, null, getAccessibilityDropConfirmation());
+            .handleAccessibleDrop(this, null, null);
     }
 
     public int getTextColor() {