Revert 237702 "rAc: pop tooltip icon bubble"

Tabbing past (?) icons now crashes chrome :(

> rAc: pop tooltip icon bubble
> 
> BUG=322802
> 
> Review URL: https://codereview.chromium.org/84303002

TBR=estade@chromium.org

Review URL: https://codereview.chromium.org/95803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237844 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237844