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

components/arc/bluetooth/arc_bluetooth_bridge.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/bluetooth/arc_bluetooth_bridge.h"
 
 #include <bluetooth/bluetooth.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/socket.h>
@@ skipping 272 matching lines @@
 
   // We can downcast here because we are always running on Chrome OS, and
   // so our adapter uses BlueZ.
   bluetooth_adapter_ =
       static_cast<bluez::BluetoothAdapterBlueZ*>(adapter.get());
 
   // The ARC instance was ready before the Bluetooth adapter, hence we didn't
   // register ourselves as an observer with it then. Since our adapter is
   // ready, we should register it now.
   if (!bluetooth_adapter_->HasObserver(this) &&
-      arc_bridge_service()->bluetooth()->instance()) {
+      arc_bridge_service()->bluetooth()->has_instance()) {
     bluetooth_adapter_->AddObserver(this);
   }
 }
 
 void ArcBluetoothBridge::OnInstanceReady() {
   mojom::BluetoothInstance* bluetooth_instance =
-      arc_bridge_service()->bluetooth()->instance();
-  if (!bluetooth_instance) {
-    LOG(ERROR) << "OnBluetoothInstanceReady called, "
-               << "but no bluetooth instance found";
-    return;
-  }
+      arc_bridge_service()->bluetooth()->GetInstanceForMethod("Init");
+  DCHECK(bluetooth_instance);
 
   bluetooth_instance->Init(binding_.CreateInterfacePtrAndBind());
 
   // The Bluetooth adapter was ready before the ARC instance, hence we didn't
   // register ourselves as an observer with it then. Since our instance is
   // ready, we should register it now.
   if (bluetooth_adapter_ && !bluetooth_adapter_->HasObserver(this))
     bluetooth_adapter_->AddObserver(this);
 }
 
@@ skipping 1710 matching lines @@
   sdp_bluetooth_instance->OnGetSdpRecords(
       status, std::move(remote_addr), target_uuid,
       mojo::Array<mojom::BluetoothSdpRecordPtr>::New(0));
 }
 
 bool ArcBluetoothBridge::CalledOnValidThread() {
   return thread_checker_.CalledOnValidThread();
 }
 
 }  // namespace arc