Rename main chromium builders

Uses the bit.ly/chromium-build-naming naming scheme.

Re-land which shouldn't break builders. Depends on https://crrev.com/c/1155263

Bug: 867725
Change-Id: I230121d1e531de5aeaeb34f09e2b1b6432008eff
Reviewed-on: https://chromium-review.googlesource.com/1153616
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#578829}
Reviewed-on: https://chromium-review.googlesource.com/1155751
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579572}
4 files changed