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Now that the XR Consent Flow has been removed, nothing checks this flag
(disabling it for tests) anymore. Remove the flag and the only place
that set it.

Bug: 1064384
Change-Id: Ie8568324c45288d7055a510b211290d6e2696699
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2220227
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773406}