Eliminate custom alpha handling in CellLayout

Also rename CellLayoutChildren to ShortcutsAndWidgetsView

Change-Id: Ic2ebc5497adb153cc2fce99730cc2c6fbdc101e6
diff --git a/src/com/android/launcher2/BubbleTextView.java b/src/com/android/launcher2/BubbleTextView.java
index 4a3a7a4..a775ed5 100644
--- a/src/com/android/launcher2/BubbleTextView.java
+++ b/src/com/android/launcher2/BubbleTextView.java
@@ -247,8 +247,8 @@
     }
 
     void setCellLayoutPressedOrFocusedIcon() {
-        if (getParent() instanceof CellLayoutChildren) {
-            CellLayoutChildren parent = (CellLayoutChildren) getParent();
+        if (getParent() instanceof ShortcutAndWidgetContainer) {
+            ShortcutAndWidgetContainer parent = (ShortcutAndWidgetContainer) getParent();
             if (parent != null) {
                 CellLayout layout = (CellLayout) parent.getParent();
                 layout.setPressedOrFocusedIcon((mPressedOrFocusedBackground != null) ? this : null);