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.
R=terelius@webrtc.org
Bug: None
Change-Id: I1d2538482e2390d91f3285124d011a578da4b61b
Reviewed-on: https://webrtc-review.googlesource.com/23564
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Oskar Sundbom <ossu@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20710}
18f26d1434