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This changes the percentage for both CI and try builders.

Bug: 1108016
Change-Id: I8a6e0e97c4f936f25ac2b9e046142bed1e72e793
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490337Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Chan Li <chanli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819469}