Revert of arc: Use the new InstanceHolder for unittests

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 1a9d91722d392d2283fd9ec5393f8cb26634c303..60e6162785df7dda68a039cb0f5949141127ef47 100644
--- a/components/arc/arc_bridge_service_impl.h
+++ b/components/arc/arc_bridge_service_impl.h
@@ -25,8 +25,7 @@
 
 // Real IPC based ArcBridgeService that is used in production.
 class ArcBridgeServiceImpl : public ArcBridgeService,
-                             public ArcBridgeBootstrap::Delegate,
-                             public mojom::ArcBridgeHost {
+                             public ArcBridgeBootstrap::Delegate {
  public:
   explicit ArcBridgeServiceImpl(std::unique_ptr<ArcBridgeBootstrap> bootstrap);
   ~ArcBridgeServiceImpl() override;
@@ -41,36 +40,6 @@
   // delay. When testing, however, we'd like it to happen immediately to avoid
   // adding unnecessary delays.
   void DisableReconnectDelayForTesting();
-
-  // ArcHost:
-  void OnAppInstanceReady(mojom::AppInstancePtr app_ptr) override;
-  void OnAudioInstanceReady(mojom::AudioInstancePtr audio_ptr) override;
-  void OnAuthInstanceReady(mojom::AuthInstancePtr auth_ptr) override;
-  void OnBluetoothInstanceReady(
-      mojom::BluetoothInstancePtr bluetooth_ptr) override;
-  void OnClipboardInstanceReady(
-      mojom::ClipboardInstancePtr clipboard_ptr) override;
-  void OnCrashCollectorInstanceReady(
-      mojom::CrashCollectorInstancePtr crash_collector_ptr) override;
-  void OnFileSystemInstanceReady(
-      mojom::FileSystemInstancePtr file_system_ptr) override;
-  void OnImeInstanceReady(mojom::ImeInstancePtr ime_ptr) override;
-  void OnIntentHelperInstanceReady(
-      mojom::IntentHelperInstancePtr intent_helper_ptr) override;
-  void OnMetricsInstanceReady(mojom::MetricsInstancePtr metrics_ptr) override;
-  void OnNetInstanceReady(mojom::NetInstancePtr net_ptr) override;
-  void OnNotificationsInstanceReady(
-      mojom::NotificationsInstancePtr notifications_ptr) override;
-  void OnObbMounterInstanceReady(
-      mojom::ObbMounterInstancePtr obb_mounter_ptr) override;
-  void OnPolicyInstanceReady(mojom::PolicyInstancePtr policy_ptr) override;
-  void OnPowerInstanceReady(mojom::PowerInstancePtr power_ptr) override;
-  void OnProcessInstanceReady(mojom::ProcessInstancePtr process_ptr) override;
-  void OnStorageManagerInstanceReady(
-      mojom::StorageManagerInstancePtr storage_manager_ptr) override;
-  void OnVideoInstanceReady(mojom::VideoInstancePtr video_ptr) override;
-  void OnWindowManagerInstanceReady(
-      mojom::WindowManagerInstancePtr window_manager_ptr) override;
 
  private:
   friend class ArcBridgeTest;