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We're having issues with high pending times on the linux CQ pool.
Disabling this for now, since experiments are optional and are
currently using up capacity.

No-Presubmit: true
Bug: 1133410
Change-Id: I4d34c8a7403249601dfbbdba450b46b97d3ef869
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438672
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Erik Staab <estaab@chromium.org>
Auto-Submit: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811773}