GUI -- Rename UIMessageHandlerTwo => UIMessageHandler. Also, make bindHandlers() private.

Change-Id: Id36e220c1285b88b8b4db0e106ef063bd8b9bfd1
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/UiWebSocket.java b/web/gui/src/main/java/org/onosproject/ui/impl/UiWebSocket.java
index d756da0..3295b9e 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/UiWebSocket.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/UiWebSocket.java
@@ -25,7 +25,7 @@
 import org.onosproject.ui.UiConnection;
 import org.onosproject.ui.UiExtensionService;
 import org.onosproject.ui.UiMessageHandlerFactory;
-import org.onosproject.ui.UiMessageHandlerTwo;
+import org.onosproject.ui.UiMessageHandler;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -56,7 +56,7 @@
 
     private long lastActive = System.currentTimeMillis();
 
-    private Map<String, UiMessageHandlerTwo> handlers;
+    private Map<String, UiMessageHandler> handlers;
 
     /**
      * Creates a new web-socket for serving data to GUI.
@@ -123,7 +123,7 @@
         try {
             ObjectNode message = (ObjectNode) mapper.reader().readTree(data);
             String type = message.path("event").asText("unknown");
-            UiMessageHandlerTwo handler = handlers.get(type);
+            UiMessageHandler handler = handlers.get(type);
             if (handler != null) {
                 handler.process(message);
             } else {