Transition win_angle_rel_ng to win-angle-rel.

This completes the src-side transition. It adds win-angle-rel to
the Milo config and removes other occurrences of win_angle_rel_ng.

One use of win_angle_rel_ng remains in third_party/pyjson5. This
file seems unmaintained so it seemed better to leave it.

Bug: 822310
Change-Id: If313f317dfad943dd03baf3252f8d55e41f515a6
No-try: true
Reviewed-on: https://chromium-review.googlesource.com/c/1403348
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621406}
5 files changed