Artem Titov 8e6749e0dd Improve fileutils_override implementation internal API.
Use absl::optional instead of special constant to show, that we failed
to get OutputPath in fileutils_override

Bug: webrtc:9792
Change-Id: Ice19a9bf425e88a747dd9b07e82dbb5bdc59685b
Reviewed-on: https://webrtc-review.googlesource.com/c/107630
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25331}
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