Remove dead taskbar code

Test: Works as before
Bug: 182512211
Change-Id: Id4c979f2924f9ae6881a9bed18bcc52fbd80c05b

quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java

@@ -338,10 +338,6 @@ public abstract class BaseQuickstepLauncher extends Launcher
     @Override
     public void onDragLayerHierarchyChanged() {
         onLauncherStateOrFocusChanged();
-
-        if (mTaskbarController != null) {
-            mTaskbarController.onLauncherDragLayerHierarchyChanged();
-        }
     }
 
     @Override