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During the initial implementation of recording |UserCancelled| as an
|Outcome|, we didn't use |kUserCancelled| because it could not resolve
the promise upon user dismissing the prompt. We used |kCancelled| as
a temporary workaround to resolve the promise.

This patch removes the workaround because we are now able to resolve
promises after crrev.com/c/2569946.

Bug: 1138454
Change-Id: Id91180b7624e5f0687b37a0864a1d64e406baf8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2579988
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835795}