Reviewed by Mark.

        Implement the FileChooser for the WebKit/Gtk+ port by using
        the GtkFileChooserDialog and g_path_get_basename to get the
        basename for the current filename.

        * WebCore.pro:
        * platform/gdk/FileChooserGdk.cpp: Added.
        (WebCore::FileChooser::FileChooser):
        (WebCore::FileChooser::~FileChooser):
        (WebCore::FileChooser::openFileChooser):
        (WebCore::FileChooser::basenameForWidth):
        * platform/gdk/TemporaryLinkStubs.cpp:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@25538 268f45cc-cd09-0410-ab3c-d52691b4dbfc