Remove candidates when doing continual gathering

webrtc/api/webrtcsession.h

Index: webrtc/api/webrtcsession.h
diff --git a/webrtc/api/webrtcsession.h b/webrtc/api/webrtcsession.h
index e8b2a05af62cce359093c914e2da8b76557c9465..9b9a821caac85d3fa58a752697d3ec1ad9ed0f33 100644
--- a/webrtc/api/webrtcsession.h
+++ b/webrtc/api/webrtcsession.h
@@ -80,6 +80,10 @@ class IceObserver {
   // New Ice candidate have been found.
   virtual void OnIceCandidate(const IceCandidateInterface* candidate) = 0;
 
+  // Some local ICE candidates have been removed.
+  virtual void OnIceCandidatesRemoved(
+      const std::vector<IceCandidateInterfaceRefPtr>& candidates) = 0;
+
   // Called whenever the state changes between receiving and not receiving.
   virtual void OnIceConnectionReceivingChange(bool receiving) {}
 
@@ -204,6 +208,9 @@ class WebRtcSession : public AudioProviderInterface,
                             std::string* err_desc);
   bool ProcessIceMessage(const IceCandidateInterface* ice_candidate);
 
+  bool RemoveRemoteIceCandidates(
+      const std::vector<IceCandidateInterfaceRefPtr>& ice_candidates);
+
   bool SetIceTransports(PeerConnectionInterface::IceTransportsType type);
 
   cricket::IceConfig ParseIceConfig(
@@ -381,6 +388,11 @@ class WebRtcSession : public AudioProviderInterface,
       const SessionDescriptionInterface* remote_desc);
   // Uses |candidate| in this session.
   bool UseCandidate(const IceCandidateInterface* candidate);
+  // Stops using the group of remote candidates in this session.
+  bool CeaseRemoteCandidates(
+      const std::vector<IceCandidateInterfaceRefPtr>& ice_candidates);
+  const cricket::ContentInfo* GetRemoteMediaContent(
+      const IceCandidateInterface* candidate) const;
   // Deletes the corresponding channel of contents that don't exist in |desc|.
   // |desc| can be null. This means that all channels are deleted.
   void RemoveUnusedChannels(const cricket::SessionDescription* desc);
@@ -434,6 +446,9 @@ class WebRtcSession : public AudioProviderInterface,
   void OnTransportControllerCandidatesGathered(
       const std::string& transport_name,
       const cricket::Candidates& candidates);
+  void OnTransportControllerCandidatesRemoved(
+      const std::string& transport_name,
+      const cricket::Candidates& candidates);
 
   std::string GetSessionErrorMsg();