Oskar Sundbom f82000328d Optional: Use nullopt and implicit construction in /rtc_base/rate_statistics.cc
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=sprang@webrtc.org

Bug: None
Change-Id: I50d25d6174486928963c2e98455587a8a9f0bee6
Reviewed-on: https://webrtc-review.googlesource.com/23616
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Oskar Sundbom <ossu@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20930}
2017-11-29 11:37:29 +00:00
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