bluetooth: Shutdown BluetoothAdapter before DBus on ChromeOS.

device/bluetooth/bluetooth_adapter.h

Index: device/bluetooth/bluetooth_adapter.h
diff --git a/device/bluetooth/bluetooth_adapter.h b/device/bluetooth/bluetooth_adapter.h
index df0621b970a7849b26119cf8a69659e4ee1c8311..f7b760bfa2987b06058e8b7e2e882a247e4dce54 100644
--- a/device/bluetooth/bluetooth_adapter.h
+++ b/device/bluetooth/bluetooth_adapter.h
@@ -192,6 +192,14 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdapter
   // Returns a weak pointer to an existing adapter for testing purposes only.
   base::WeakPtr<BluetoothAdapter> GetWeakPtrForTesting();
 
+#if defined(OS_CHROMEOS)
+  // Shutdown the adapter: tear down and clean up all objects owned by
+  // BluetoothAdapter. After this call, the BluetoothAdapter will behave as if
+  // no Bluetooth controller exists in the local system. |IsPresent| will return
+  // false.
+  void Shutdown();
+#endif
+
   // Adds and removes observers for events on this bluetooth adapter. If
   // monitoring multiple adapters, check the |adapter| parameter of observer
   // methods to determine which adapter is issuing the event.