Fixes for other places where we expect CellLayoutChildren instead of CellLayout. (3392097)

Change-Id: I9df13c413ce62a2760ce6a8ebafed1e948088de2
diff --git a/src/com/android/launcher2/Launcher.java b/src/com/android/launcher2/Launcher.java
index 8614865..a5799ae 100644
--- a/src/com/android/launcher2/Launcher.java
+++ b/src/com/android/launcher2/Launcher.java
@@ -3331,7 +3331,8 @@
         int count = workspace.getChildCount();
         for (int i = 0; i < count; i++) {
             // Use removeAllViewsInLayout() to avoid an extra requestLayout() and invalidate().
-            ((ViewGroup) workspace.getChildAt(i)).removeAllViewsInLayout();
+            final ViewGroup layout = ((CellLayout) workspace.getChildAt(i)).getChildrenLayout();
+            layout.removeAllViewsInLayout();
         }
 
         if (DEBUG_USER_INTERFACE) {