Changes places where we explicitly construct an Optional to instead use
nullopt or the requisite value type only.
This CL was uploaded by git cl split
Bug: None
Change-Id: Ifca0183c2675a8d4e74c21b86f1724d9b2c01f5d
Reviewed-on: https://webrtc-review.googlesource.com/23579
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Oskar Sundbom <ossu@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21580}