Fix infinite loop when registering data usage callback.

Trivial fix is to call the method that takes the handler as a param.

Bug: 29508547
Change-Id: I75ba30a1663be265eed56b24deda82e83fd47a43

core/java/android/app/usage/NetworkStatsManager.java

@@ -305,7 +305,8 @@ public class NetworkStatsManager {
      */
     public void registerUsageCallback(int networkType, String subscriberId, long thresholdBytes,
             UsageCallback callback) {
-        registerUsageCallback(networkType, subscriberId, thresholdBytes, null /* handler */);
+        registerUsageCallback(networkType, subscriberId, thresholdBytes, callback,
+                null /* handler */);
     }
 
     /**