Fix a crash on launcher db upgrade.
diff --git a/src/com/android/launcher2/LauncherProvider.java b/src/com/android/launcher2/LauncherProvider.java
index ae343fc..457f2f7 100644
--- a/src/com/android/launcher2/LauncherProvider.java
+++ b/src/com/android/launcher2/LauncherProvider.java
@@ -480,6 +480,7 @@
         private void normalizeIcons(SQLiteDatabase db) {
             Log.d(TAG, "normalizing icons");
 
+            db.beginTransaction();
             Cursor c = null;
             try {
                 boolean logged = false;