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Since there is no server side dependencies, we decided to enable the
feature by default. The feature flag will be used as killer-switch
in case anything goes wrong and clean up in future milestones.

Bug: 921142
Test: manual tests
Change-Id: Ibc849d549a394b6487626e6d71435a14e76e9ad6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348010
Commit-Queue: Li Lin <llin@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796908}