Revert 159702 "Generate HTMLElementFactory with Python"

> Generate HTMLElementFactory with Python
> 
> This CL replaces the old Perl-based HTMLElementFactory with
> a Python implementation based in jinja2 templates.
> 
> R=eseidel@chromium.org
> 
> Review URL: https://codereview.chromium.org/27009005

Mac compile failure on the walterfall after blink roll.
Please see the comment in https://codereview.chromium.org/26615003/.

TBR=abarth@chromium.org

Review URL: https://codereview.chromium.org/27497002

git-svn-id: svn://svn.chromium.org/blink/trunk@159750 bbb929c8-8fbe-4397-9dbb-9b2b20218538