Remove reference to policy_testserver.py The file has been removed in https://crrev.com/c/3452227. Bug: chromium:1270314 Change-Id: I8c0a00540cd820f852364ad3f8b17ccdb3711225 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3452114 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>