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After this CL, reconfiguring the FlexFEC payload type at the WebRtcVideoChannel2 level will no longer lead to the recreation of the VideoReceiveStream. This means that the jitter buffer will not be destroyed and a smoother video playback is achieved during SDP renegotiation. BUG=webrtc:5654 Review-Url: https://codereview.webrtc.org/2911913002 Cr-Commit-Position: refs/heads/master@{#18318}