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The flag is no longer needed since the Gaia endpoint has been rolled out
to prod. The only consumer of Reauth feature is backed by its own
feature flag.

Bug: 1045515
Change-Id: Ia12aa2abfc064a431c1a24ab85de231c07e8ebfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339530
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Auto-Submit: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796358}