Implement DBus changes needed for notifications.

device/bluetooth/dbus/bluetooth_gatt_descriptor_delegate_wrapper.h

Index: device/bluetooth/dbus/bluetooth_gatt_descriptor_delegate_wrapper.h
diff --git a/device/bluetooth/dbus/bluetooth_gatt_descriptor_delegate_wrapper.h b/device/bluetooth/dbus/bluetooth_gatt_descriptor_delegate_wrapper.h
index 8536b17ddda5ffb6878f2b16f454d7b6e33bb3b8..0a2cdca12e45558d90a4e6c46c75d26f8f4aad7f 100644
--- a/device/bluetooth/dbus/bluetooth_gatt_descriptor_delegate_wrapper.h
+++ b/device/bluetooth/dbus/bluetooth_gatt_descriptor_delegate_wrapper.h
@@ -27,6 +27,7 @@ class BluetoothGattDescriptorDelegateWrapper
       BluetoothLocalGattServiceBlueZ* service,
       BluetoothLocalGattDescriptorBlueZ* descriptor);
 
+  // BluetoothGattAttributeValueDelegate overrides:
   void GetValue(
       const device::BluetoothLocalGattService::Delegate::ValueCallback&
           callback,
@@ -37,6 +38,8 @@ class BluetoothGattDescriptorDelegateWrapper
       const base::Closure& callback,
       const device::BluetoothLocalGattService::Delegate::ErrorCallback&
           error_callback) override;
+  void StartNotifications() override {}
+  void StopNotifications() override {}
 
  private:
   BluetoothLocalGattServiceBlueZ* service_;