Build fix.

    Build fix.

        Rename the items in the ContextMenuAction enum so that they don't
        conflict with WebKit names.

        * WebCore.xcodeproj/project.pbxproj:
        * platform/ContextMenu.cpp:
        (WebCore::ContextMenu::populate):
        * platform/ContextMenu.h:
        (WebCore::):
        (WebCore::ContextMenuItem::ContextMenuItem):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@17807 268f45cc-cd09-0410-ab3c-d52691b4dbfc