* Use cgi.escape for Python 2.7 and html.escape for Python 3.
* Modify unittest to succeed in both Python 2.7 and 3.
No-Presubmit: True
Bug: None
Change-Id: Ie711873468145c9abbd12313086ebe7358e20ab7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/220621
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34156}