Remove candidates when doing continual gathering

talk/app/webrtc/jsepsessiondescription.h

 /*
  * libjingle
  * Copyright 2012 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 56 matching lines @@
   }
   virtual std::string session_version() const {
     return session_version_;
   }
   virtual std::string type() const {
     return type_;
   }
   // Allow changing the type. Used for testing.
   void set_type(const std::string& type) { type_ = type; }
   virtual bool AddCandidate(const IceCandidateInterface* candidate);
+  virtual bool RemoveCandidate(const IceCandidateInterface* candidate);
   virtual size_t number_of_mediasections() const;
   virtual const IceCandidateCollection* candidates(
       size_t mediasection_index) const;
   virtual bool ToString(std::string* out) const;
 
   // Default video encoder settings. The resolution is the max resolution.
   // TODO(perkj): Implement proper negotiation of video resolution.
   static const int kDefaultVideoCodecId;
   static const int kDefaultVideoCodecFramerate;
   static const char kDefaultVideoCodecName[];
@@ skipping 10 matching lines @@
 
   bool GetMediasectionIndex(const IceCandidateInterface* candidate,
                             size_t* index);
 
   RTC_DISALLOW_COPY_AND_ASSIGN(JsepSessionDescription);
 };
 
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_JSEPSESSIONDESCRIPTION_H_