Reviewed by Dmitry Titov.

        Do not fire focus events while a modal dialog is up.
        https://bugs.webkit.org/show_bug.cgi?id=33962

        Modifies the FocusController to check the frame's page's defersLoading() flag before firing blur/focus events.
        This flag is set while a modal dialog (like a window.alert or window.confirm) is up.  Firing the events causes
        assertion failures, since when the dialog is dismissed the PageGroupLoadDeferrer assumes that no script has run.

        Manual tests only as DumpRenderTree does not support modal dialogs

        * manual-tests/modal-dialog-blur-selfclose.html: Added.
        * manual-tests/modal-dialog-blur.html: Added.
        * page/FocusController.cpp:
        (WebCore::dispatchEventsOnWindowAndFocusedNode):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@55205 268f45cc-cd09-0410-ab3c-d52691b4dbfc