Revert of Add the url attribute to the IceCandidate (Java Wrapper)

webrtc/examples/androidapp/src/org/appspot/apprtc/DirectRTCClient.java

 /*
  *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 169 matching lines @@
   @Override
   public void sendLocalIceCandidate(final IceCandidate candidate) {
     executor.execute(new Runnable() {
       @Override
       public void run() {
         JSONObject json = new JSONObject();
         jsonPut(json, "type", "candidate");
         jsonPut(json, "label", candidate.sdpMLineIndex);
         jsonPut(json, "id", candidate.sdpMid);
         jsonPut(json, "candidate", candidate.sdp);
-        jsonPut(json, "url", candidate.serverUrl);
 
         if (roomState != ConnectionState.CONNECTED) {
           reportError("Sending ICE candidate in non connected state.");
           return;
         }
         sendMessage(json.toString());
       }
     });
   }
 
@@ skipping 129 matching lines @@
       throw new RuntimeException(e);
     }
   }
 
   // Converts a Java candidate to a JSONObject.
   private static JSONObject toJsonCandidate(final IceCandidate candidate) {
     JSONObject json = new JSONObject();
     jsonPut(json, "label", candidate.sdpMLineIndex);
     jsonPut(json, "id", candidate.sdpMid);
     jsonPut(json, "candidate", candidate.sdp);
-    jsonPut(json, "url", candidate.serverUrl);
     return json;
   }
 
   // Converts a JSON candidate to a Java object.
   private static IceCandidate toJavaCandidate(JSONObject json) throws JSONException {
-    return new IceCandidate(json.getString("id"), json.getInt("label"), json.getString("candidate"),
-        json.getString("url"));
+    return new IceCandidate(
+        json.getString("id"), json.getInt("label"), json.getString("candidate"));
   }
 }