arc: bluetooth: Don't unset bluetooth_adapter_

components/arc/bluetooth/arc_bluetooth_bridge.cc

Index: components/arc/bluetooth/arc_bluetooth_bridge.cc
diff --git a/components/arc/bluetooth/arc_bluetooth_bridge.cc b/components/arc/bluetooth/arc_bluetooth_bridge.cc
index 6a2df7fa71ae2ce901c36314884e3a9c5c9ca5bd..4e4ca1252e54781fab526bcabd7109b07c921bb5 100644
--- a/components/arc/bluetooth/arc_bluetooth_bridge.cc
+++ b/components/arc/bluetooth/arc_bluetooth_bridge.cc
@@ -190,17 +190,6 @@ void ArcBluetoothBridge::OnInstanceReady() {
   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())