arc_bridge: Add more logging, plus cleanup

components/arc/net/arc_net_host_impl.cc

Index: components/arc/net/arc_net_host_impl.cc
diff --git a/components/arc/net/arc_net_host_impl.cc b/components/arc/net/arc_net_host_impl.cc
index 8e2acd3121c7f0cd3a29cc818f95ff81aeaf34e0..678f12457f47528e93d363b00b2f8dcceabd111d 100644
--- a/components/arc/net/arc_net_host_impl.cc
+++ b/components/arc/net/arc_net_host_impl.cc
@@ -177,8 +177,12 @@ void ArcNetHostImpl::StartScan() {
 }
 
 void ArcNetHostImpl::ScanCompleted(const chromeos::DeviceState* /*unused*/) {
+  if (!arc_bridge_service()->net_instance()) {
+    VLOG(2) << "NetInstance not ready yet";
+    return;
+  }
   if (arc_bridge_service()->net_version() < 1) {
-    VLOG(1) << "ArcBridgeService does not support ScanCompleted.";
+    VLOG(1) << "NetInstance does not support ScanCompleted.";
     return;
   }