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"Accept-Ranges" header are not required for servers supporting range
requests. This CL changes the accept_range field in DownloadCreateInfo
to use an enum so that we can experiment parallel download even if
range support is unsure.

BUG=917366

Change-Id: I9d6d444437650957b12225da0cada85d0cce5473
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1645480Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666527}