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If "RunUntilRedirect" or "RunUntilAuthRequired" is run and the request
unexpectedly finishes, TestDelegate will crash for trying to run the
"on_complete_" closure, which would be null, and crashes with a very
unhelpful message. A DCHECK and comment have been added that should make
The issue a little more clear.

Bug: 1000299
Change-Id: I537e8f2abc7754323bdaedcd7ee5d802ea674c9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1782502Reviewed-by: David Benjamin <davidben@chromium.org>
Commit-Queue: Aaron Tagliaboschi <aarontag@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693120}