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This has been launched since M76, so we can safely remove the feature
flag at this point.

Bug: 917190
Change-Id: I1bc9c9727d4d3ae0d0c60b99b7747c3d19b5429c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1792230
Commit-Queue: Varun Khaneja <vakh@chromium.org>
Auto-Submit: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694905}