Remove candidates when doing continual gathering

talk/app/webrtc/jsepicecandidate.cc

 /*
  * 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 78 matching lines @@
     if ((*it)->sdp_mid() == candidate->sdp_mid() &&
         (*it)->sdp_mline_index() == candidate->sdp_mline_index() &&
         (*it)->candidate().IsEquivalent(candidate->candidate())) {
       ret = true;
       break;
     }
   }
   return ret;
 }
 
+int JsepCandidateCollection::remove(const IceCandidateInterface* target) {
+  size_t original_size = candidates_.size();
+  auto new_end = std::remove_if(
+      candidates_.begin(), candidates_.end(),
+      [target](JsepIceCandidate* candidate) {
+        return target->candidate().IsWeaklyEquivalent(candidate->candidate());
+      });
+  candidates_.erase(new_end, candidates_.end());
+  return candidates_.size() - original_size;
+}
+
 }  // namespace webrtc