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This simplifies passing it around both on the client and on the server.

Bug: 1043929
Change-Id: If04978a2757d6bdda3366f1882b85978b3aa3b55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017355
Commit-Queue: vitaliii <vitaliii@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Auto-Submit: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734896}