arc: bluetooth: Don't unset bluetooth_adapter_

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 172 matching lines @@
   mojom::BluetoothInstance* bluetooth_instance =
       arc_bridge_service()->bluetooth()->instance();
   if (!bluetooth_instance) {
     LOG(ERROR) << "OnBluetoothInstanceReady called, "
                << "but no bluetooth instance found";
     return;
   }
   bluetooth_instance->Init(binding_.CreateInterfacePtrAndBind());
 }
 
-void ArcBluetoothBridge::AdapterPresentChanged(BluetoothAdapter* adapter,
-                                               bool present) {
-  DCHECK(CalledOnValidThread());
-
-  // If the adapter goes away, remove ourselves as an observer.
-  if (!present && adapter == bluetooth_adapter_) {
-    adapter->RemoveObserver(this);
-    bluetooth_adapter_ = nullptr;
-  }
-}
-
 void ArcBluetoothBridge::AdapterPoweredChanged(BluetoothAdapter* adapter,
                                                bool powered) {
   if (!HasBluetoothInstance())
     return;
 
   // TODO(smbarber): Invoke EnableAdapter or DisableAdapter via ARC bridge
   // service.
 }
 
 void ArcBluetoothBridge::DeviceAdded(BluetoothAdapter* adapter,
@@ skipping 1357 matching lines @@
   LOG(WARNING) << "Bluetooth instance is too old (version " << version
                << ") need version " << version_need;
   return false;
 }
 
 bool ArcBluetoothBridge::CalledOnValidThread() {
   return thread_checker_.CalledOnValidThread();
 }
 
 }  // namespace arc