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ByteStreamReader is in content/ and download should avoid such dependency.
Replace all the ByteStreamReader mocks with mocks of download::InputStream

Bug: 803135
Change-Id: I3650d482943c604bedc39c0db8ec7b1021656fe4
Reviewed-on: https://chromium-review.googlesource.com/957446Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542293}