Reviewed by Adam.

        Move the ContextMenu and ContextMenuItem stubs to
        ContextMenuGdk.cpp and ContextMenuItemGdk.cpp.

        * WebCore.pro:
        * platform/gdk/ContextMenuGdk.cpp: Added.
        (WebCore::ContextMenu::ContextMenu):
        (WebCore::ContextMenu::~ContextMenu):
        (WebCore::ContextMenu::appendItem):
        (WebCore::ContextMenu::setPlatformDescription):
        (WebCore::ContextMenu::platformDescription):
        (WebCore::ContextMenu::releasePlatformDescription):
        * platform/gdk/ContextMenuItemGdk.cpp: Added.
        (WebCore::ContextMenuItem::ContextMenuItem):
        (WebCore::ContextMenuItem::~ContextMenuItem):
        (WebCore::ContextMenuItem::releasePlatformDescription):
        (WebCore::ContextMenuItem::type):
        (WebCore::ContextMenuItem::setType):
        (WebCore::ContextMenuItem::action):
        (WebCore::ContextMenuItem::setAction):
        (WebCore::ContextMenuItem::title):
        (WebCore::ContextMenuItem::setTitle):
        (WebCore::ContextMenuItem::platformSubMenu):
        (WebCore::ContextMenuItem::setSubMenu):
        (WebCore::ContextMenuItem::setChecked):
        * platform/gdk/TemporaryLinkStubs.cpp:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@25650 268f45cc-cd09-0410-ab3c-d52691b4dbfc