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

chrome/browser/chromeos/arc/arc_auth_service.cc

Index: chrome/browser/chromeos/arc/arc_auth_service.cc
diff --git a/chrome/browser/chromeos/arc/arc_auth_service.cc b/chrome/browser/chromeos/arc/arc_auth_service.cc
index 2e8ad05bd143a9f806fc4a988984218bdba50906..4263d1468290b74e864aeb3b679020dd66141d83 100644
--- a/chrome/browser/chromeos/arc/arc_auth_service.cc
+++ b/chrome/browser/chromeos/arc/arc_auth_service.cc
@@ -229,8 +229,9 @@ bool ArcAuthService::IsAllowedForProfile(const Profile* profile) {
 }
 
 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) {