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We're planning to remove support for options when switching from GCM to
FCM and this API was the only user of this field. Unexpiring it so we
can have fresh metrics (the old data showed 0 usage).

Bug: 1148321
Change-Id: I223e80ba0e6e88d3e4344377aec988e1488f954d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2534832Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827404}