[FIX] Toolbar: Opened overflow popup is not closed on overflow-button
click.

Add overflow button to AutoCloseAreas Aggregation of the Popup, so that
Popup knows about it and autoclose does not come if clicking on this
overflow button.  

CSS: 1482029157 2014. 
CR-Id: 012006153200015017232014
Change-Id: I3a69d421f34a26f63b2e4de8d9ad911febc4204a
Merge "[FIX] Toolbar: Opened overflow popup is not closed on overflow-button click." into rel-1.26