Reviewed by Adam Barth.

        make_names.pl should always generate all names in Names.* files
        https://bugs.webkit.org/show_bug.cgi?id=42023

        Only the *ElementFactory files need to have conditional contents
        based on enabled features.  WebCore should always have all known
        names for SVG, MathML, XML, XLink, HTML, etc. generated in the
        various *Names files, even if features are disabled.

        make_names.pl is kinda a big hack at this point.  I tried to clean
        up a little as I went.  The way I made *Names include all names was to
        read the .in files twice, once using the preprocessor and once without.

        * dom/make_names.pl:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@63109 268f45cc-cd09-0410-ab3c-d52691b4dbfc