Switch from Delegate to Observer.

components/arc/arc_bridge_service_impl.h

Index: components/arc/arc_bridge_service_impl.h
diff --git a/components/arc/arc_bridge_service_impl.h b/components/arc/arc_bridge_service_impl.h
index 872582bc64b09989a9bba8a12795f07f97b60df7..1c3afaec5d9ac0124de157c13a0becb226d101cb 100644
--- a/components/arc/arc_bridge_service_impl.h
+++ b/components/arc/arc_bridge_service_impl.h
@@ -25,7 +25,7 @@ namespace arc {
 
 // Real IPC based ArcBridgeService that is used in production.
 class ArcBridgeServiceImpl : public ArcBridgeService,
-                             public ArcBridgeBootstrap::Delegate {
+                             public ArcBridgeBootstrap::Observer {
  public:
   // This is the factory interface to inject ArcBridgeBootstrap instance
   // for testing purpose.
@@ -65,8 +65,8 @@ class ArcBridgeServiceImpl : public ArcBridgeService,
   // Stops the running instance.
   void StopInstance();
 
-  // ArcBridgeBootstrap::Delegate:
-  void OnConnectionEstablished(mojom::ArcBridgeInstancePtr instance) override;
+  // ArcBridgeBootstrap::Observer:
+  void OnReady() override;
   void OnStopped(StopReason reason) override;
 
   std::unique_ptr<ArcBridgeBootstrap> bootstrap_;
@@ -74,10 +74,6 @@ class ArcBridgeServiceImpl : public ArcBridgeService,
   // If the user's session has started.
   bool session_started_;
 
-  // Mojo endpoint.
-  // TODO(hidehiko): Move this to ArcBridgeBootstrap.
-  std::unique_ptr<mojom::ArcBridgeHost> arc_bridge_host_;
-
   // If the instance had already been started but the connection to it was
   // lost. This should make the instance restart.
   bool reconnect_ = false;