[Splitting] TMMBRHelp class simplifted (and disappear because become too simple)

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
index 214472f81ae3998cce8838ecca09eb40ac89d70c..f836b0fac5cae1cb907dc3469d20d6d83194a626 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
@@ -954,8 +954,9 @@ bool ModuleRtpRtcpImpl::UpdateRTCPReceiveInformationTimers() {
 }
 
 // Called from RTCPsender.
-int32_t ModuleRtpRtcpImpl::BoundingSet(bool* tmmbr_owner,
-                                       TMMBRSet* bounding_set) {
+int32_t ModuleRtpRtcpImpl::BoundingSet(
+    bool* tmmbr_owner,
+    std::vector<rtcp::TmmbItem>* bounding_set) {
   return rtcp_receiver_.BoundingSet(tmmbr_owner, bounding_set);
 }