* More canonical and efficient 'move to front'.
* Don't use 'new' when value semantic is fine.
* Simplify flow (remove One-off private method).
* Remove dead code.
Bug: webrtc:9575
Change-Id: Ie6a3c4e3d5e2342e77e54fd59fffa05f6e5f9ebe
Reviewed-on: https://webrtc-review.googlesource.com/92802
Commit-Queue: Yves Gerey <yvesg@webrtc.org>
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24215}