Reviewed by Timothy.

    Reviewed by Timothy.

        http://bugzilla.opendarwin.org/show_bug.cgi?id=6637
        Bug 6637: selecting node in Inspector after closing window crashes Safari

        When the window the Web Inspector was inspecting is closed, the inspector goes into its
        no-selection state. Choosing to inspect another element activates it again. The inspector
        will also follow the WebView if the URL changes and select the root element on the new page.

        * WebInspector/WebInspector.m:
        (-[NSWindow setWebFrame:]):
        (-[NSWindow setRootDOMNode:]):
        (-[WebInspector _revealAndSelectNodeInTree:]):
        (-[WebInspector _update]):
        (-[WebInspector _updateRoot]):
        (-[WebInspector inspectedWebViewProgressFinished:]):
        (-[WebInspector inspectedWindowWillClose:]):
        (-[WebInspector webView:didFinishLoadForFrame:]):
        * WebInspector/WebInspectorPanel.m:
        (-[WebInspectorPanel canBecomeMainWindow]):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@13976 268f45cc-cd09-0410-ab3c-d52691b4dbfc