When deleting an object in the Editor in 4.3, the object loses knowledge of its parent once OnDestroy is called. This was not the case in 4.2.

Reproduction Steps:

1. Import attached project in a 4.2 version of the Editor
2. Open the scene DeleteTestScene
3. Select the object "ChildGameObject" (child of "ParentGameObject") -observe the message "My parent is ParentGameObject" in the console
4. Delete the object, observe the message "My parent is ParentGameObject" once again
5. Repeat Steps 1-3, but with a 4.3 version of the Editor
6. Delete the object, observe the message "I don't have a parent!"