Stefan Holmer 9d69c3f4d9 Return a copy of the supported RTP header extensions instead of a reference.
This also renames the method to better reflect what it does.

BUG=webrtc:5187
R=pbos@webrtc.org, pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1486123002 .

Cr-Commit-Position: refs/heads/master@{#10910}
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