Web Inspector: Cmd+L (Go-to-Line) masks Go to location bar action
https://bugs.webkit.org/show_bug.cgi?id=111357

Reviewed by Pavel Feldman.

Allow panel shortcut handlers to bubble event.

* inspector/front-end/GoToLineDialog.js:
(WebInspector.GoToLineDialog.install): Minor refactoring, added JSDocs.
(WebInspector.GoToLineDialog._show): Added JSDocs and return value.
* inspector/front-end/Panel.js:
(WebInspector.Panel.prototype.handleShortcut):
Mark event as handled iff handler returned true.
* inspector/front-end/ScriptsPanel.js: Added return values to handlers.
* inspector/front-end/TimelinePanel.js: Ditto.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145045 268f45cc-cd09-0410-ab3c-d52691b4dbfc