arc: Revamp the ArcBridgeService interface

components/arc/net/arc_net_host_impl.h

Index: components/arc/net/arc_net_host_impl.h
diff --git a/components/arc/net/arc_net_host_impl.h b/components/arc/net/arc_net_host_impl.h
index 8aa52b75982e88623330d0ee50e01a1a09535309..2085764d328d2821428544d9e93814944bf3301b 100644
--- a/components/arc/net/arc_net_host_impl.h
+++ b/components/arc/net/arc_net_host_impl.h
@@ -30,10 +30,11 @@ namespace arc {
 class ArcBridgeService;
 
 // Private implementation of ArcNetHost.
-class ArcNetHostImpl : public ArcService,
-                       public ArcBridgeService::Observer,
-                       public chromeos::NetworkStateHandlerObserver,
-                       public mojom::NetHost {
+class ArcNetHostImpl
+    : public ArcService,
+      public ArcBridgeService::InstanceObserver<mojom::NetInstance>,
+      public chromeos::NetworkStateHandlerObserver,
+      public mojom::NetHost {
  public:
   // The constructor will register an Observer with ArcBridgeService.
   explicit ArcNetHostImpl(ArcBridgeService* arc_bridge_service);
@@ -77,8 +78,9 @@ class ArcNetHostImpl : public ArcService,
   void DeviceListChanged() override;
   void GetDefaultNetwork(const GetDefaultNetworkCallback& callback) override;
 
-  // Overridden from ArcBridgeService::Observer:
-  void OnNetInstanceReady() override;
+  // Overridden from ArcBridgeService::InterfaceObserver<mojom::NetInstance>:
+  void OnInstanceReady(mojom::NetInstance* net_instance,
+                       uint32_t version) override;
 
  private:
   void DefaultNetworkSuccessCallback(const std::string& service_path,