Web Inspector: Popover does not disappear, causes debugger failure.

Web Inspector: Popover does not disappear, causes debugger failure.
https://bugs.webkit.org/show_bug.cgi?id=71363

Reviewed by Pavel Feldman.

This is a work-around simple enough for a merge. The real fix would
be to get TextViewer to manage the highlight on its own, so it's not
accidently removed while re-building DOM for the text chunk.

* inspector/front-end/JavaScriptSourceFrame.js:
(WebInspector.JavaScriptSourceFrame.prototype._onHidePopover):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105261 268f45cc-cd09-0410-ab3c-d52691b4dbfc