The Chromium testing pool now has a sufficient number of devices for
testing. The old pool is deprecated.

No-Try: true
Bug: chromium:1226561
Change-Id: I6a985da860d4d2d5a30ccfd2c6593cce54b930c4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3006414
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75561}