Refactor Nearby Message listener

chrome/android/java/src/org/chromium/chrome/browser/physicalweb/NearbyMessageIntentService.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.physicalweb;
 
 import android.app.IntentService;
 import android.content.Intent;
 
 import com.google.android.gms.nearby.Nearby;
-import com.google.android.gms.nearby.messages.Message;
 import com.google.android.gms.nearby.messages.MessageListener;
 
 /**
  * Service that handles intents from Nearby.
  */
 public class NearbyMessageIntentService extends IntentService {
-    private static final MessageListener MESSAGE_LISTENER = new MessageListener() {
-        @Override
-        public void onFound(Message message) {
-            String url = PhysicalWebBleClient.getInstance().getUrlFromMessage(message);
-            if (url != null) {
-                UrlManager.getInstance().addUrl(new UrlInfo(url));
-            }
-        }
+    private static final MessageListener MESSAGE_LISTENER =
+            PhysicalWebBleClient.getInstance().createBackgroundMessageListener();
 
-        @Override
-        public void onLost(Message message) {
-            String url = PhysicalWebBleClient.getInstance().getUrlFromMessage(message);
-            if (url != null) {
-                UrlManager.getInstance().removeUrl(new UrlInfo(url));
-            }
-        }
-    };
 
     public NearbyMessageIntentService() {
         super(NearbyMessageIntentService.class.getSimpleName());
         setIntentRedelivery(true);
     }
 
     @Override
     protected void onHandleIntent(Intent intent) {
         Nearby.Messages.handleIntent(intent, MESSAGE_LISTENER);
     }
 }