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This CL allows InProgressDownloadManager to take a URLLoaderFactoryGetter,
and resume the download by itself.

BUG=842245

Change-Id: Ie2e6dff715455ee8449be05d49c43144de8d25c8
Reviewed-on: https://chromium-review.googlesource.com/1102885Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568729}