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This moves the remainder of the tests in pool=chromium.tests.cros.vm to
the main test pool by applying the magic named-cache optional-dimension
to every test/bot that uses the 'chromeos-amd64-generic' mixin.

Bug: 1132206
Change-Id: I94dcaecdb21f2a8b36c432273ef7dc0ae690f4c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490549Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819656}