GTK+ build fix. Back out r31183. This patch also introduced API style
        issues.

        * WebCoreSupport/FrameLoaderClientGtk.cpp:
        (WebKit::FrameLoaderClient::dispatchDecidePolicyForNavigationAction):
        * webkit/headers.pri:
        * webkit/webkit-marshal.list:
        * webkit/webkitdefines.h:
        * webkit/webkitnavigationaction.cpp: Removed.
        * webkit/webkitnavigationaction.h: Removed.
        * webkit/webkitprivate.cpp:
        * webkit/webkitprivate.h:
        * webkit/webkitwebview.cpp:
        * webkit/webkitwebview.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@31184 268f45cc-cd09-0410-ab3c-d52691b4dbfc