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We can get rid of our custom chunking.

Bug: 776009
Change-Id: Ib5ffe7ce1e4e1b6758a5963c68fc0eedb9af8e41
Reviewed-on: https://chromium-review.googlesource.com/869191
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533333}