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All the parallel requests are now half open, no need for this field.
And it is very strange to pass a request's length to download file, as
the download file should know the whole file length, rather than
an individual stream's length.

BUG=1011427

Change-Id: Id29b5c2859441e7bfffee165bc760c183b5a6882
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841183
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703539}