WidgetTray on Kitkat

- Fix "getDrawable" not found runtime exception by getting rid of dead code

Change-Id: Id511a6c0c4ea1070f5f498cf6458548ace7c54f7
diff --git a/src/com/android/launcher3/LauncherStateTransitionAnimation.java b/src/com/android/launcher3/LauncherStateTransitionAnimation.java
index 57bd5b2..78272a8 100644
--- a/src/com/android/launcher3/LauncherStateTransitionAnimation.java
+++ b/src/com/android/launcher3/LauncherStateTransitionAnimation.java
@@ -184,11 +184,6 @@
         final WidgetsContainerView toView = mLauncher.getWidgetsView();
         PrivateTransitionCallbacks cb = new PrivateTransitionCallbacks() {
             @Override
-            public void onRevealViewVisible(View revealView, View contentView,
-                    View allAppsButtonView) {
-                revealView.setBackground(mLauncher.getDrawable(R.drawable.quantum_panel_dark));
-            }
-            @Override
             public float getMaterialRevealViewFinalAlpha(View revealView) {
                 return 0.3f;
             }