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When CORS is involved there may be multiple network::URLLoader associated
with one InProgressRequest, because CorsURLLoader may create a new
network::URLLoader for the same request id in redirect handling - see
CorsURLLoader::FollowRedirect. In such a case the old network::URLLoader
is going to be detached fairly soon, so we don't need to take care of it.

Bug: 1043874
Change-Id: Icd91931d817898f59980fbadbb17ad6e63df07cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2011781Reviewed-by: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Matt Mueller <mattm@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734458}