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Feature launched in M70, and has been default enabled since, this CL
removes the flag from Chrome's code, and the switch from
chrome://flags

Bug: 936008
Change-Id: I57772ccc041b137255e39b220777e739d72c9789
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1644788
Commit-Queue: Carlos IL <carlosil@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Henrique Grandinetti <hgrandinetti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667233}