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The flag has been enabled by default since M71 and the feature has been
well received by other browers as well as the community.

Bug: 1090670
Change-Id: Ia1e93bae53932b0b6e16b979612afe702c458657
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315016
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Kamila Hasanbega <hkamila@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799098}