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This class was previously used by DownloadRequestCore in
non network service code path. We no longer need this now.

BUG=934009

Change-Id: I827d2f644eed739fd95f544b3f402e1bc7e957f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1733420
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684103}