New setting to allow applications to completely supress the
        default context menu that is generated by WebKit. This allows them
        to still pass the vent to the default handler without needing to
        use ugly hacks such as handling populate-popup, and removing all
        the items from the default context menu.

        * webkit/webkitwebsettings.cpp:
        (webkit_web_settings_class_init):
        (webkit_web_settings_set_property):
        (webkit_web_settings_get_property):
        (webkit_web_settings_copy):
        * webkit/webkitwebview.cpp:
        (webkit_web_view_forward_context_menu_event):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@52087 268f45cc-cd09-0410-ab3c-d52691b4dbfc