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Based on a stable 1% experimental launch in M-85 new backend appears to
be stable. Enabling it by default so that it rolls out to all users as
part of M-87.

Bug: 637404
Change-Id: I57d996c1cef5c5c097561c9c23b9ae713825e4a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436292
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Commit-Queue: James Hollyer <jameshollyer@chromium.org>
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Reviewed-by: James Hollyer <jameshollyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811437}