After the refactoring of RenderMathMLRoot and RenderMathMLScripts, the corresponding anonymous flexbox wrappers have been removed so RenderObject::isRenderMathMLRootWrapper and RenderObject::isRenderMathMLScriptsWrapper are not used anymore.
Created attachment 282515 [details] Patch
Committed r202726: <http://trac.webkit.org/changeset/202726>