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This CL adds the logic to download HTTP error response body in content.

Doc: go/chrome-download-non-successful-server-response

Bug: 765778
Change-Id: I367a9678502de8aace3208776b0dcca51e26c764
Reviewed-on: https://chromium-review.googlesource.com/669300Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505190}