Web Inspector: Improve focus switching in scripts panel.

Web Inspector: Improve focus switching in scripts panel.
https://bugs.webkit.org/show_bug.cgi?id=76628

Reviewed by Pavel Feldman.

* inspector/front-end/Dialog.js:
(WebInspector.Dialog.prototype._hide):
* inspector/front-end/FilteredItemSelectionDialog.js:
(WebInspector.FilteredItemSelectionDialog.prototype.onEnter):
(WebInspector.JavaScriptOutlineDialog.prototype.selectItem):
* inspector/front-end/ScriptsNavigator.js:
(WebInspector.ScriptsNavigator.prototype.get defaultFocusedElement):
* inspector/front-end/ScriptsPanel.js:
(WebInspector.ScriptsPanel.prototype._showSourceLine):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105410 268f45cc-cd09-0410-ab3c-d52691b4dbfc