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We are making a corresponding change to the server controlled
experiment. This change brings the waterfall tests closer in character
to what is in the field.

Bug: 1154693
Change-Id: I47ec85a18c195b878ee1b0bc074c99417951a000
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568624
Commit-Queue: Asanka Herath <asanka@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#833090}