Pure political theatre here.

Presumably the committee on the status of women covers a lot more issues than abortion.  

Scheer has said he won't re-open the abortion debate.  

Even if he did, the Liberals have a majority.  If the committee were to somehow propose to re-open the abortion debate, the Liberals would use their majority to close it.

Shame on the Liberals for protesting a female chair on the basis of her personal beliefs on an issue that's not even up for debate.