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To disambiguate missing a RequestFinishedInfoListener vs. missing the
general UrlRequest executor, add a new error type.

Bug: 879208
Change-Id: I71b15ebf520fbb53b91a03721ea7291f4b50a435
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1559705
Commit-Queue: Caleb Raitto <caraitto@chromium.org>
Reviewed-by: Misha Efimov <mef@chromium.org>
Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#650468}