081af25c11
Enforces previous kProtectionKeyOnLoss as the permanent method which was the only one used in use. This simplifies SetVideoProtection and transition over to SetReceiverRobustnessMode. BUG=webrtc:1596 R=stefan@webrtc.org Review URL: https://codereview.webrtc.org/1244753002 Cr-Commit-Position: refs/heads/master@{#9641}