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This is to support mojo sockets. With mojo sockets, we always try to read from
mojo data pipes (without caller explictly telling us to read), and we need a way
to cancel pending reads without having buffered data in socket subclasses.

Bug: 875855
Change-Id: I6570c5320c1ae84b6ef1eddd9ed8ba71e1c8a46c
Reviewed-on: https://chromium-review.googlesource.com/1185209Reviewed-by: Bence Béky <bnc@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585256}