Revert of Unify rtcp packet setters

webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h

Index: webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h b/webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h
index 762dc61138d569f8e4f024dada08f5fa4352edcd..8707a5dbaf2c29ce29200080826ed6f014a9d271 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h
@@ -27,8 +27,8 @@
   Psfb() : sender_ssrc_(0), media_ssrc_(0) {}
   ~Psfb() override {}
 
-  void SetSenderSsrc(uint32_t ssrc) { sender_ssrc_ = ssrc; }
-  void SetMediaSsrc(uint32_t ssrc) { media_ssrc_ = ssrc; }
+  void From(uint32_t ssrc) { sender_ssrc_ = ssrc; }
+  void To(uint32_t ssrc) { media_ssrc_ = ssrc; }
 
   uint32_t sender_ssrc() const { return sender_ssrc_; }
   uint32_t media_ssrc() const { return media_ssrc_; }