Revert of Unify rtcp packet setters

webrtc/modules/rtp_rtcp/source/rtcp_packet/remb.cc

Index: webrtc/modules/rtp_rtcp/source/rtcp_packet/remb.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_packet/remb.cc b/webrtc/modules/rtp_rtcp/source/rtcp_packet/remb.cc
index ac5fc1a68fe1bf7e8abff5c8fcf072b1dffa0d68..2f59fbbd55f3d387f8e89f85248065d6697fed83 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_packet/remb.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_packet/remb.cc
@@ -9,8 +9,6 @@
  */
 
 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/remb.h"
-
-#include <utility>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
@@ -83,12 +81,22 @@
   return true;
 }
 
-bool Remb::SetSsrcs(std::vector<uint32_t> ssrcs) {
-  if (ssrcs.size() > kMaxNumberOfSsrcs) {
+bool Remb::AppliesTo(uint32_t ssrc) {
+  if (ssrcs_.size() >= kMaxNumberOfSsrcs) {
+    LOG(LS_WARNING) << "Max number of REMB feedback SSRCs reached.";
+    return false;
+  }
+  ssrcs_.push_back(ssrc);
+  return true;
+}
+
+bool Remb::AppliesToMany(const std::vector<uint32_t>& ssrcs) {
+  if (ssrcs_.size() + ssrcs.size() > kMaxNumberOfSsrcs) {
     LOG(LS_WARNING) << "Not enough space for all given SSRCs.";
     return false;
   }
-  ssrcs_ = std::move(ssrcs);
+  // Append.
+  ssrcs_.insert(ssrcs_.end(), ssrcs.begin(), ssrcs.end());
   return true;
 }