Don't refcount TRACK_DEFAULT requests.

This has no concrete impact on the behavior of ConnectivityService,
but in principle TRACK_DEFAULT requests should not be counted toward
requests that make a network foreground. It does not have an impact
because only VPNs could be affected by this, and VPNs are always in
the foreground by definition.

Test: runtest frameworks-net
Test: cts
Change-Id: Id2ae6b5c9d542fe168e64ed713b6ec0a04062c82

services/core/java/com/android/server/connectivity/NetworkAgentInfo.java

@@ -285,7 +285,6 @@ public class NetworkAgentInfo implements Comparable<NetworkAgentInfo> {
         int delta = add ? +1 : -1;
         switch (request.type) {
             case REQUEST:
-            case TRACK_DEFAULT:
                 mNumRequestNetworkRequests += delta;
                 break;
 
@@ -294,6 +293,7 @@ public class NetworkAgentInfo implements Comparable<NetworkAgentInfo> {
                 mNumBackgroundNetworkRequests += delta;
                 break;
 
+            case TRACK_DEFAULT:
             case LISTEN:
                 break;