Remove candidates when doing continual gathering

talk/app/webrtc/webrtcsession.h

Index: talk/app/webrtc/webrtcsession.h
diff --git a/talk/app/webrtc/webrtcsession.h b/talk/app/webrtc/webrtcsession.h
index cd3f8967261232faee479eb26d370907b23566e9..dda3fcd1580a8617b71399d0316ccefa23992f87 100644
--- a/talk/app/webrtc/webrtcsession.h
+++ b/talk/app/webrtc/webrtcsession.h
@@ -399,8 +399,12 @@ class WebRtcSession : public AudioProviderInterface,
   // Uses all remote candidates in |remote_desc| in this session.
   bool UseCandidatesInSessionDescription(
       const SessionDescriptionInterface* remote_desc);
-  // Uses |candidate| in this session.
-  bool UseCandidate(const IceCandidateInterface* candidate);
+  // Adds a remote candidate to this session.
+  bool AddRemoteCandidate(const IceCandidateInterface* candidate);
+  // Removes a remote candidate from this session.
+  bool RemoveRemoteCandidate(const IceCandidateInterface* candidate);
+  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);
@@ -454,6 +458,9 @@ 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();