Test autofill popup window shows at the correct location.

1. Enter 'Always show bookmarks bar' in the following text input area.
2. Enter 'Test' in the text input area.
3. Press 'a' and make sure 'Always show bookmarks bar' is shown in autofill popup window.
4. Select all with pressing Ctrl-a.
5. Press 't' and make sure 'Test' is shown and the popup window location is correct.