arc_bridge: Add more logging, plus cleanup

components/arc/net/arc_net_host_impl.cc

 // 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.
 
 #include "components/arc/net/arc_net_host_impl.h"
 
 #include <memory>
 #include <string>
 #include <vector>
 
@@ skipping 159 matching lines @@
         chromeos::network_handler::ErrorCallback());
     callback.Run(true);
   }
 }
 
 void ArcNetHostImpl::StartScan() {
   GetStateHandler()->RequestScan();
 }
 
 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;
   }
 
   arc_bridge_service()->net_instance()->ScanCompleted();
 }
 
 void ArcNetHostImpl::OnShuttingDown() {
   GetStateHandler()->RemoveObserver(this, FROM_HERE);
 }
 
 }  // namespace arc