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This feature is intended to ship in 79, so the flag should be enabled
by default.

Intent to Ship:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/Nvll21RaKwM/fTn8qUaNBwAJ

Bug: 1013739
Change-Id: I195c07cd61c2058533c2fa6640263567be248a40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1857008
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706576}