Web Inspector: Go to line dialog has 0 height, viewport dialogs have empty gaps.
https://bugs.webkit.org/show_bug.cgi?id=113702

Reviewed by Yury Semikhatsky.

* inspector/front-end/DOMExtension.js:
(Element.prototype.measurePreferredSize):
* inspector/front-end/Popover.js:
(WebInspector.Popover.prototype._innerShow):
* inspector/front-end/ViewportControl.js:
(WebInspector.ViewportControl.prototype.refresh):
* inspector/front-end/dialog.css:
(.dialog-contents):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147323 268f45cc-cd09-0410-ab3c-d52691b4dbfc