Revert of Unify rtcp packet setters

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

Index: webrtc/modules/rtp_rtcp/source/rtcp_packet/fir.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_packet/fir.h b/webrtc/modules/rtp_rtcp/source/rtcp_packet/fir.h
index 59f3b617294d63322b2e9fe3baf0fa01b2c115d6..ddf2cfaf2a4319cca617bbed86e0b41d4bf4de75 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_packet/fir.h
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_packet/fir.h
@@ -36,8 +36,8 @@
   // Parse assumes header is already parsed and validated.
   bool Parse(const CommonHeader& packet);
 
-  void AddRequestTo(uint32_t ssrc, uint8_t seq_num) {
-    items_.emplace_back(ssrc, seq_num);
+  void WithRequestTo(uint32_t ssrc, uint8_t seq_num) {
+    items_.push_back(Request(ssrc, seq_num));
   }
   const std::vector<Request>& requests() const { return items_; }
 
@@ -53,7 +53,7 @@
     return kHeaderLength + kCommonFeedbackLength + kFciLength * items_.size();
   }
   // SSRC of media source is not used in FIR packet. Shadow base functions.
-  void SetMediaSsrc(uint32_t ssrc);
+  void To(uint32_t ssrc);
   uint32_t media_ssrc() const;
 
   std::vector<Request> items_;