bluetooth: web: Bluetooth does not yet inherit EventTarget; crash fix.

third_party/WebKit/Source/modules/bluetooth/Bluetooth.idl

 // Copyright 2014 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.
 
 // https://webbluetoothcg.github.io/web-bluetooth/#bluetooth
 
 [
     RuntimeEnabled=WebBluetooth,
-] interface Bluetooth : EventTarget {
+] interface Bluetooth {
     [CallWith=ScriptState, RaisesException, MeasureAs=WebBluetoothRequestDevice] Promise<BluetoothDevice> requestDevice (
         RequestDeviceOptions options
         );
 };