Remove HTML's dependency on make_names.pl

This CL finishes the transition from Perl to Python for HTMLTagNames.in and
HTMLAttributeNames.in.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/27447002

git-svn-id: svn://svn.chromium.org/blink/trunk@159968 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Update dependency on content tests

BUG=none
R=jam@chromium.org

Review URL: https://codereview.chromium.org/28093002

git-svn-id: svn://svn.chromium.org/blink/trunk@159969 bbb929c8-8fbe-4397-9dbb-9b2b20218538