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This will prevent the goma bots from running tests on 10.10, which is
being deprecated, and which appears to fail the tests anyway.

Change-Id: I17ed6c430e5ea3ee7b7eaa95fd6653038706fece
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2641146Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845744}