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This CL picks up a bugfix integrated into protobuf as part of commit:
http://cl/342360226

This fix is responsible for fixing a bug in the serialization code
when trying serialize/deserialize protobuf messages at the end of an
iostream

Change-Id: I7608174a083b6b63c152c1250d3ccd1fd53914c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2535667Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Ryan Keane <rwkeane@google.com>
Cr-Commit-Position: refs/heads/master@{#833751}