to align with chromium scoped_refptr implementation
and prefer move over copy in some cases.
Bug: webrtc:11078
Change-Id: I3178e74e611e4b23435668878e6bcc98bc2ce77d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/159541
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29768}