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The passthrough decoder has been default on Linux since Aug 25, 2020. We
don't need to test the validating decoder on the CQ.

Bug: chromium:976283
Change-Id: I0f21d1dfb996708705aacb281fa03465fe56dbbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615460
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841630}