bluetooth: Shutdown BluetoothAdapter before DBus on ChromeOS.

device/bluetooth/bluetooth_adapter.cc

Index: device/bluetooth/bluetooth_adapter.cc
diff --git a/device/bluetooth/bluetooth_adapter.cc b/device/bluetooth/bluetooth_adapter.cc
index 3a2ab0e2a52892219e76aaf89c0c4f11f83be83c..52c2d74d6cffe25e27c6b11abc5b6de5f348e3fc 100644
--- a/device/bluetooth/bluetooth_adapter.cc
+++ b/device/bluetooth/bluetooth_adapter.cc
@@ -24,6 +24,12 @@ base::WeakPtr<BluetoothAdapter> BluetoothAdapter::CreateAdapter(
 }
 #endif  // !defined(OS_CHROMEOS) && !defined(OS_WIN) && !defined(OS_MACOSX)
 
+#if defined(OS_CHROMEOS)
+void BluetoothAdapter::Shutdown() {
+  NOTIMPLEMENTED();
+}
+#endif
+
 BluetoothAdapter::BluetoothAdapter()
     : weak_ptr_factory_(this) {
 }