Allow previous view hierarchy to be GC'ed more quickly on rotation

Change-Id: I76215a48e76234501b7ce253dedfa449502ab88f
diff --git a/src/com/android/launcher2/LauncherAppWidgetHost.java b/src/com/android/launcher2/LauncherAppWidgetHost.java
index 46e66e7..68d4903 100644
--- a/src/com/android/launcher2/LauncherAppWidgetHost.java
+++ b/src/com/android/launcher2/LauncherAppWidgetHost.java
@@ -36,4 +36,10 @@
             AppWidgetProviderInfo appWidget) {
         return new LauncherAppWidgetHostView(context);
     }
+
+    @Override
+    public void stopListening() {
+        super.stopListening();
+        clearViews();
+    }
 }