Yet another step for bug 160543. After bug 161050, the mrow-like features of MathMLPresentationElement are moved into a separate class so MathMLSpaceElement and MathMLTokenElement can now be derived from that class.
Created attachment 287089 [details] Patch
Comment on attachment 287089 [details] Patch Clearing flags on attachment: 287089 Committed r205100: <http://trac.webkit.org/changeset/205100>
All reviewed patches have been landed. Closing bug.