Reviewed by Antonio Gomes.

        Should use eventSender for simulating keyboard events instead of using js
        event.initKeyboardEvent. Otherwise, inside WebCore, the keyboardevent
        object does not have a "PlatformKeyboardEvent" associated with it and this
        results different behavior as the real key press.
        This code change unveils that test snav-multiple-select.html is broken. It
        alos causes snav-single-select.html hangs on Mac. These will be fixed in
        seperate patches.
        https://bugs.webkit.org/show_bug.cgi?id=48134

        * fast/events/spatial-navigation/resources/spatial-navigation-utils.js:
        (doMove):
        * fast/events/spatial-navigation/snav-multiple-select-expected.txt:
        * platform/mac/Skipped:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@70481 268f45cc-cd09-0410-ab3c-d52691b4dbfc