Disable Save prompt (No/Cancel/Yes) for non-host clients closing file with "X" on tab

```
What steps will reproduce the problem?
1. Host shares file
2. Non-host opens file
3. Non-host closes file, and is prompted to save
4. Non-host selects 'Yes'

What is the expected output? What do you see instead?
Expected: Save dialog
Getting: Nothing.  File does not get saved.

```

Original issue reported on code.google.com by `rvmille...@gmail.com` on 13 Apr 2011 at 7:48
