arc: Notify ARC instance failures via callbacks.

components/arc/user_data/arc_user_data_service.cc

 // Copyright 2016 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/user_data/arc_user_data_service.h"
 
 #include "base/command_line.h"
 #include "chromeos/chromeos_switches.h"
 #include "chromeos/cryptohome/cryptohome_parameters.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
@@ skipping 13 matching lines @@
       primary_user_account_id_(account_id) {
   arc_bridge_service()->AddObserver(this);
   ClearIfDisabled();
 }
 
 ArcUserDataService::~ArcUserDataService() {
   DCHECK(thread_checker_.CalledOnValidThread());
   arc_bridge_service()->RemoveObserver(this);
 }
 
-void ArcUserDataService::OnBridgeStopped() {
+void ArcUserDataService::OnBridgeStopped(ArcBridgeService::StopReason reason) {
   DCHECK(thread_checker_.CalledOnValidThread());
   const AccountId& account_id =
       user_manager::UserManager::Get()->GetPrimaryUser()->GetAccountId();
   if (account_id != primary_user_account_id_) {
     LOG(ERROR) << "User preferences not loaded for "
                << primary_user_account_id_.GetUserEmail()
                << ", but current primary user is " << account_id.GetUserEmail();
     primary_user_account_id_ = EmptyAccountId();
     return;
   }
@@ skipping 11 matching lines @@
           chromeos::switches::kDisableArcDataWipe)) {
     return;
   }
   const cryptohome::Identification cryptohome_id(primary_user_account_id_);
   chromeos::SessionManagerClient* session_manager_client =
       chromeos::DBusThreadManager::Get()->GetSessionManagerClient();
   session_manager_client->RemoveArcData(cryptohome_id);
 }
 
 }  // namespace arc