Pass around the candidate removals events in IOS clients

webrtc/examples/objc/AppRTCDemo/RTCICECandidate+JSON.m

 /*
  *  Copyright 2014 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 31 matching lines @@
       [NSJSONSerialization dataWithJSONObject:json
                                       options:NSJSONWritingPrettyPrinted
                                         error:&error];
   if (error) {
     RTCLogError(@"Error serializing JSON: %@", error);
     return nil;
   }
   return data;
 }
 
+- (NSDictionary *)JSONDictionary{
+  NSDictionary *json = @{
+    kRTCICECandidateMLineIndexKey : @(self.sdpMLineIndex),

[tkchin_webrtc, 2016/05/17 02:01:43]

the reason why I didn't like JSONDictionary is because this dictionary is not
the same as the dictionary in JSONData. Maybe the better thing is to have
JSONData call JSONDictionary and then add the type key somewhere else.

but otherwise agree we don't want dup-strings

[honghaiz3, 2016/05/17 06:11:24]

Done. Passed in the type key as an argument. 

+    kRTCICECandidateMidKey : self.sdpMid,
+    kRTCICECandidateSdpKey : self.sdp
+  };
+  return json;
+}
+
 @end