Moving apps search related logic into a custom layout file

This will allow derivative projects to easily change the search behavior
by simply overriding the xml file

Bug: 37616877
Change-Id: Ib8d6a2dab06819a52611e9a3d97c70c5a49bbf97

src/com/android/launcher3/BaseRecyclerView.java

@@ -82,10 +82,6 @@ public abstract class BaseRecyclerView extends RecyclerView
         }
     }
 
-    public void reset() {
-        mScrollbar.reattachThumbToScroll();
-    }
-
     @Override
     protected void onFinishInflate() {
         super.onFinishInflate();