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This CL calls the InProgressDownloadManager to delete ResourceDownloader
after response is completed.
It also fixes the issue when download is cancelled.
The new CL fixes an issue that StreamHandleInputStream::OnStreamCompleted() could get called twice

TBR=xingliu@chromium.org
BUG=864189

Change-Id: Ia46040ceee88fd9978911c26ee32765a1ac4a099
Reviewed-on: https://chromium-review.googlesource.com/1142462Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576401}