Windows build is broken recently. e.g.: https://build.webkit.org/builders/Apple%20Win%2010%20Debug%20%28Build%29/builds/14384 error C2039: 'nameForRenderTreeAsText': is not a member of 'WebCore::Color' r263786 passed in https://build.webkit.org/builders/Apple%20Win%2010%20Release%20%28Build%29/builds/14753 r263788 failed in https://build.webkit.org/builders/Apple%20Win%2010%20Release%20%28Build%29/builds/14754
<rdar://problem/64985276>
Committed r263800: <https://trac.webkit.org/changeset/263800>