Remove candidates when doing continual gathering

talk/app/webrtc/jsepsessiondescription.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 136 matching lines @@
                            static_cast<int>(mediasection_index),
                            updated_candidate));
   if (!candidate_collection_[mediasection_index].HasCandidate(
           updated_candidate_wrapper.get()))
     candidate_collection_[mediasection_index].add(
         updated_candidate_wrapper.release());
 
   return true;
 }
 
+bool JsepSessionDescription::RemoveCandidate(
+    const IceCandidateInterface* candidate) {
+  if (!candidate || candidate->sdp_mline_index() < 0 ||
+      candidate->candidate().priority() != 0) {
+    return false;
+  }
+  size_t mediasection_index = 0;
+  if (!GetMediasectionIndex(candidate, &mediasection_index) ||
+      mediasection_index >= number_of_mediasections()) {
+    return false;
+  }
+  int num_removed = candidate_collection_[mediasection_index].remove(candidate);
+  ASSERT(num_removed <= 1);
+  return num_removed > 0;
+}
+
 size_t JsepSessionDescription::number_of_mediasections() const {
   if (!description_)
     return 0;
   return description_->contents().size();
 }
 
 const IceCandidateCollection* JsepSessionDescription::candidates(
     size_t mediasection_index) const {
   if (mediasection_index >= candidate_collection_.size())
     return NULL;
@@ skipping 27 matching lines @@
     if (!found) {
       // If the sdp_mid is presented but we can't find a match, we consider
       // this as an error.
       return false;
     }
   }
   return true;
 }
 
 }  // namespace webrtc