Danil Chapovalov e0ec125dae Add CopyOnWriteBuffer::empty accessor
CopyOnWriteBuffer is a container-like type,
lack of empty accessor is often surprising.

Bug: None
Change-Id: I9db1e3837aa596810729e9bf92e366fbce3908d3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/328382
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Auto-Submit: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41234}
2023-11-24 18:37:34 +00:00
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