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It is a follow up CL to https://webrtc-review.googlesource.com/c/src/+/179368. Now when network stats became more complex structure it's better to hide its implementation details and provide an interface for read-only access. Bug: webrtc:11756 Change-Id: I1980ef938f8de0c6aa90092d1dc90a14a82e0ee1 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/179840 Commit-Queue: Tommi <tommi@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Tommi <tommi@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31784}