Remove DeltaExtras JSON serialisation support as it's not needed outbound.

Author: Quintin Willison

lib/src/main/java/io/ably/lib/types/DeltaExtras.java

@@ -87,15 +87,4 @@ public boolean equals(Object o) {
 	public int hashCode() {
 		return Objects.hash(format, from);
 	}
-
-	public static class Serializer implements JsonSerializer<DeltaExtras> {
-		@Override
-		public JsonElement serialize(final DeltaExtras src, final Type typeOfSrc, final JsonSerializationContext context) {
-			final JsonObject json = new JsonObject();
-			final Gson gson = Serialisation.gson;
-			json.addProperty(FORMAT, src.getFormat());
-			json.addProperty(FROM, src.getFrom());
-			return json;
-		}
-	}
 }

lib/src/main/java/io/ably/lib/util/Serialisation.java

@@ -46,7 +46,6 @@ public class Serialisation {
 		gsonBuilder = new GsonBuilder();
 		gsonBuilder.registerTypeAdapter(Message.class, new Message.Serializer());
 		gsonBuilder.registerTypeAdapter(MessageExtras.class, new MessageExtras.Serializer());
-		gsonBuilder.registerTypeAdapter(DeltaExtras.class, new DeltaExtras.Serializer());
 		gsonBuilder.registerTypeAdapter(PresenceMessage.class, new PresenceMessage.Serializer());
 		gsonBuilder.registerTypeAdapter(PresenceMessage.Action.class, new PresenceMessage.ActionSerializer());
 		gsonBuilder.registerTypeAdapter(ProtocolMessage.Action.class, new ProtocolMessage.ActionSerializer());