Always use arc::InstanceHolder<T>::GetInstanceForMethod

chrome/browser/chromeos/arc/arc_auth_service.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 "chrome/browser/chromeos/arc/arc_auth_service.h"
 
 #include <utility>
 
 #include "ash/common/shelf/shelf_delegate.h"
 #include "ash/common/wm_shell.h"
@@ skipping 211 matching lines @@
   if (user_manager::UserManager::Get()
           ->IsCurrentUserCryptohomeDataEphemeral()) {
     VLOG(2) << "Users with ephemeral data are not supported in Arc.";
     return false;
   }
 
   return true;
 }
 
 void ArcAuthService::OnInstanceReady() {
-  arc_bridge_service()->auth()->instance()->Init(
-      binding_.CreateInterfacePtrAndBind());
+  auto* instance = arc_bridge_service()->auth()->GetInstanceForMethod("Init");
+  CHECK(instance);
+  instance->Init(binding_.CreateInterfacePtrAndBind());
 }
 
 void ArcAuthService::OnBridgeStopped(ArcBridgeService::StopReason reason) {
   // TODO(crbug.com/625923): Use |reason| to report more detailed errors.
   if (arc_sign_in_timer_.IsRunning()) {
     OnSignInFailedInternal(ProvisioningResult::ARC_STOPPED);
   }
 
   if (clear_required_) {
     // This should be always true, but just in case as this is looked at
@@ skipping 664 matching lines @@
       return os << kStateFetchingCode;
     case ArcAuthService::State::ACTIVE:
       return os << kStateActive;
     default:
       NOTREACHED();
       return os;
   }
 }
 
 }  // namespace arc