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It has been enabled by default on desktop for a while now. The feature
is still required, since SharedArrayBuffer is still not enabled by
default on Android.

Bug: 821270
Change-Id: Ie58c4bb4118648391f533f310a8f093f9fa4e19b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015564Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Ben Smith <binji@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734576}