Rubber-stamped by Oliver Hunt.

        Improve keyboard navigation of Select elements.
        Home/End and PageUp/PageDn buttons do not do anything in drop down lists,
        on non-Mac platforms.
        https://bugs.webkit.org/show_bug.cgi?id=22784

        One more round of speculative fixes:
         - Really fix the general and win expected results.  (They were missing a return.)
         - Disable the test for gtk (and remove the attempted workaround for that platform).

        * fast/forms/select-popup-pagekeys-expected.txt:
        * fast/forms/select-popup-pagekeys.html:
        * platform/gtk/Skipped:
        * platform/win/fast/forms/select-popup-pagekeys-expected.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@46262 268f45cc-cd09-0410-ab3c-d52691b4dbfc