Toolbar: tab key cycles through every toolbar item (chrome)

[bill]

See test_Toolbar.html, and click on the scissors of any of the toolbars.

The tab key should move between toolbars (and it does so on firefox) but on chrome (version 1) it cycles through every item in the toolbar.

Shift-tab cycles through every item too, but in reverse.

This is different than #8987, safari's tabbing problem.

[bill]

Closing in favor of #8987, to fix tabbing on chrome 2 instead of chrome 1.