Remove unused conditional includes of {MathML,SVG}Names.h
https://bugs.webkit.org/show_bug.cgi?id=110809

Reviewed by Eric Seidel.

* html/parser/HTMLConstructionSite.cpp:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144030 268f45cc-cd09-0410-ab3c-d52691b4dbfc