Removing some methods from the DragSource

This makes is easier to create new DragSource and sets up
proper default values in DragOptions

Change-Id: I6cb0b1df41b9730cf29f785fe85fe7f0b573ee3a
diff --git a/src/com/android/launcher3/UninstallDropTarget.java b/src/com/android/launcher3/UninstallDropTarget.java
index 902fd34..3f7de06 100644
--- a/src/com/android/launcher3/UninstallDropTarget.java
+++ b/src/com/android/launcher3/UninstallDropTarget.java
@@ -44,7 +44,7 @@
     }
 
     @Override
-    protected boolean supportsDrop(DragSource source, ItemInfo info) {
+    protected boolean supportsDrop(ItemInfo info) {
         return supportsDrop(getContext(), info);
     }