Inconsistent ESC key handling when in dialog select field

[Olek Nowodziński]

1. Open any dialog with native HTML select combo box (i.e. link dialog).
2. Open "protocol" select.
3. Press ESC.
4. • Chrome: Select collapsed, dialog visible.
   • Others: Dialog closed.

This behavior must be consistent.

[Jakub Ś]

Problem can be reproduced in Webkit browsers from CKEditor 3.6.4 rev. [7516].

Before this rev all browsers were closing dialog on escape.

[Jakub Ś]

NOTE: Tickets that were fixed by this rev. #9310 and #8985