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This is a roll using my internal change to the exporter script
(http://cl/274893271). The main motivation is to roll the change to the
BUILD.gn file (to get the proto_java_library target), although this
also rolls miscellaneous proto changes which have landed since the last
roll.

Bug: 1011991
Test: None
Change-Id: Ibcbe003f0c386bd2081944c77ecc26a3cd88d559
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862727
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706222}