Bug 1215012 - mdnsd - Firefox Beta Android excessive battery usage r=xeonchen

mobile/android/base/mdns/MulticastDNSManager.java

@@ -40,12 +40,7 @@ public abstract class MulticastDNSManager {
 
     public static MulticastDNSManager getInstance(final Context context) {
         if (instance == null) {
-            // Bug 1188935: There's a bug on Android 4.4 and before.
-            if (Versions.feature21Plus) {
-                instance = new NsdMulticastDNSManager(context);
-            } else {
-                instance = new DummyMulticastDNSManager();
-            }
+            instance = new DummyMulticastDNSManager();
         }
         return instance;
     }