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DownloadFile can simply use the TaskRunner is was created on to post tasks.

BUG=803135

Change-Id: Idaccfba1c719d96a2fa11d933809ce4573004ee6
Reviewed-on: https://chromium-review.googlesource.com/952204
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541553}