Allow set_xxx_response() methods to accept base::nullopt
This allows unit tests that uses FakeConciergeClient to test the case where base::nullopt response is passed to these callbacks without needing to modify the existing tests at all. BUG=b:136128691 TEST=try Change-Id: I25b31be7f060b419184e891413d21b5a645ac46b Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894042Reviewed-by:Ryo Hashimoto <hashimoto@chromium.org> Commit-Queue: Yusuke Sato <yusukes@chromium.org> Cr-Commit-Position: refs/heads/master@{#711635}
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