GitLab

Update bot dimensions for linux-perf after OS upgrade from
Ubuntu 14.04 to 18.04.

Bug: 1162000
Change-Id: Ia2f40977120ccf0ac4b2037114c3d20ba5bdeb7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617240Reviewed-by: Wenbin Zhang <wenbinzhang@google.com>
Auto-Submit: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841340}