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This CL addresses some comments left in:
https://chromium-review.googlesource.com/c/chromium/src/+/1832723.
It now reads the remote blob interface directly rather than
converting it to a BlobDataHandle first.

BUG=947395

Change-Id: Ie9ecdaab3fa392f0c99f51eb73d5b0f8590cfbef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869751
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710153}