Remove candidates when doing continual gathering

talk/app/webrtc/jsepicecandidate.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 64 matching lines @@
     return candidates_.size();
   }
   virtual bool HasCandidate(const IceCandidateInterface* candidate) const;
   // Adds and takes ownership of the JsepIceCandidate.
   virtual void add(JsepIceCandidate* candidate) {
     candidates_.push_back(candidate);
   }
   virtual const IceCandidateInterface* at(size_t index) const {
     return candidates_[index];
   }
+  virtual int remove(const IceCandidateInterface* candidate);
 
  private:
   std::vector<JsepIceCandidate*> candidates_;
 };
 
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_JSEPICECANDIDATE_H_