GitLab

Removes instances of master/slave.

Bug: 1169441
Change-Id: I3f937efb0c1a4f49d31514c0c5db5e8e0037d146
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643630
Commit-Queue: John Delaney <johnidel@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845931}