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Remove experiment percentage from the builder, help detect issues like https://crrev.com/c/2519039, which needed to be reverted.

Bug: 1148424
Change-Id: Iacd92899e5b85a8a4f6508ba18be1c93b9af51ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537411Reviewed-by: Erik Staab <estaab@chromium.org>
Commit-Queue: Chong Gu <chonggu@google.com>
Auto-Submit: Chong Gu <chonggu@google.com>
Cr-Commit-Position: refs/heads/master@{#827892}