arc: Use GET_INTERFACE_FOR_METHOD macro

chrome/browser/chromeos/arc/policy/arc_policy_bridge.cc

Index: chrome/browser/chromeos/arc/policy/arc_policy_bridge.cc
diff --git a/chrome/browser/chromeos/arc/policy/arc_policy_bridge.cc b/chrome/browser/chromeos/arc/policy/arc_policy_bridge.cc
index e8fb5980d78a7873eefd8e37b0da2591acc227f1..ae70a338abb79b297881c60130d51c31af64b058 100644
--- a/chrome/browser/chromeos/arc/policy/arc_policy_bridge.cc
+++ b/chrome/browser/chromeos/arc/policy/arc_policy_bridge.cc
@@ -285,7 +285,7 @@ void ArcPolicyBridge::OnInstanceReady() {
   policy_service_->AddObserver(policy::POLICY_DOMAIN_CHROME, this);
 
   mojom::PolicyInstance* const policy_instance =
-      arc_bridge_service()->policy()->GetInstanceForMethod("Init");
+      ARC_GET_INSTANCE_FOR_METHOD(arc_bridge_service()->policy(), Init);
   DCHECK(policy_instance);
   policy_instance->Init(binding_.CreateInterfacePtrAndBind());
 }
@@ -367,8 +367,8 @@ void ArcPolicyBridge::OnPolicyUpdated(const policy::PolicyNamespace& ns,
                                       const policy::PolicyMap& previous,
                                       const policy::PolicyMap& current) {
   VLOG(1) << "ArcPolicyBridge::OnPolicyUpdated";
-  auto* instance =
-      arc_bridge_service()->policy()->GetInstanceForMethod("OnPolicyUpdated");
+  auto* instance = ARC_GET_INSTANCE_FOR_METHOD(arc_bridge_service()->policy(),
+                                               OnPolicyUpdated);
   if (!instance)
     return;
   instance->OnPolicyUpdated();