Danil Chapovalov b769894025 Remove rule that discourages passing optional by const reference
include example to demonstrate:
(subjectively) increased readability
(objectively) decreased binary size

Bug: None
Change-Id: I970e668af98d98725b2d527f44169a8b7c9d2338
Reviewed-on: https://webrtc-review.googlesource.com/c/121420
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Johannes Kron <kron@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26545}
2019-02-05 11:58:05 +00:00
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