Reland the CL to remove candidates when doing continual gathering

webrtc/api/peerconnection.cc

Index: webrtc/api/peerconnection.cc
diff --git a/webrtc/api/peerconnection.cc b/webrtc/api/peerconnection.cc
index e4ab40e3b251524fb38cf13523a3eb21c6173d77..54e76d46c95bf20329ee93f6e903aa77fafa8ce7 100644
--- a/webrtc/api/peerconnection.cc
+++ b/webrtc/api/peerconnection.cc
@@ -1205,6 +1205,12 @@ bool PeerConnection::AddIceCandidate(
   return session_->ProcessIceMessage(ice_candidate);
 }
 
+bool PeerConnection::RemoveIceCandidates(
+    const std::vector<cricket::Candidate>& candidates) {
+  TRACE_EVENT0("webrtc", "PeerConnection::RemoveIceCandidates");
+  return session_->RemoveRemoteIceCandidates(candidates);
+}
+
 void PeerConnection::RegisterUMAObserver(UMAObserver* observer) {
   TRACE_EVENT0("webrtc", "PeerConnection::RegisterUmaObserver");
   uma_observer_ = observer;
@@ -1384,6 +1390,12 @@ void PeerConnection::OnIceCandidate(const IceCandidateInterface* candidate) {
   observer_->OnIceCandidate(candidate);
 }
 
+void PeerConnection::OnIceCandidatesRemoved(
+    const std::vector<cricket::Candidate>& candidates) {
+  RTC_DCHECK(signaling_thread()->IsCurrent());
+  observer_->OnIceCandidatesRemoved(candidates);
+}
+
 void PeerConnection::OnIceConnectionReceivingChange(bool receiving) {
   RTC_DCHECK(signaling_thread()->IsCurrent());
   observer_->OnIceConnectionReceivingChange(receiving);