Make LauncherModel.deleteItemFromDatabase write to disk async.

Fixes a bunch of StrictMode violations and removes TODOs.

Change-Id: I886bd071d4a8336c228d29c517a8ffc5223c0623
diff --git a/src/com/android/launcher2/LauncherModel.java b/src/com/android/launcher2/LauncherModel.java
index c1ecf50..06fcfb3 100644
--- a/src/com/android/launcher2/LauncherModel.java
+++ b/src/com/android/launcher2/LauncherModel.java
@@ -269,8 +269,12 @@
      */
     static void deleteItemFromDatabase(Context context, ItemInfo item) {
         final ContentResolver cr = context.getContentResolver();
-
-        cr.delete(LauncherSettings.Favorites.getContentUri(item.id, false), null, null);
+        final Uri uriToDelete = LauncherSettings.Favorites.getContentUri(item.id, false);
+        new Thread("deleteItemFromDatabase") {
+            public void run() {
+                cr.delete(uriToDelete, null, null);
+            }
+        }.start();
     }
 
     /**