GitLab

Mustash/mash was shut down over a year ago. Clean up mash references in
DEPS files. Remove a few obsolete entries.

All the mash bugs referenced in the files were already closed.

Bug: none
Change-Id: I4205fb880d69f0e1ddaae133458bf9f2c0d8a6c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225456Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773853}