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In preparation of 100% stable rollout, this CL turns on the feature
by default, and deletes the field trial configuration.

Bug: 1128629, 1006111
Change-Id: I03b8af9c5a3bbcb2b5ff20b567c86366e3122217
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561910
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832138}