Remove non-standard DeviceOrientation Event initializers.

third_party/WebKit/Source/modules/device_orientation/DeviceOrientationEvent.idl

 /*
  * Copyright 2010, The Android Open Source Project
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 13 matching lines @@
  */
 
 // https://www.w3.org/TR/2016/CR-orientation-event-20160818/#deviceorientation
 
 [Constructor(DOMString type, optional DeviceOrientationEventInit eventInitDict)]
 interface DeviceOrientationEvent : Event {
     readonly attribute double? alpha;
     readonly attribute double? beta;
     readonly attribute double? gamma;
     readonly attribute boolean absolute;
-
-    // TODO(foolip): The init*Event() methods are not in the spec:
-    // https://github.com/w3c/deviceorientation/issues/18
-    [Measure] void initDeviceOrientationEvent([Default=Undefined] optional DOMString type,
-                                              [Default=Undefined] optional boolean bubbles,
-                                              [Default=Undefined] optional boolean cancelable,
-                                              [Default=Undefined] optional double? alpha,
-                                              [Default=Undefined] optional double? beta,
-                                              [Default=Undefined] optional double? gamma,
-                                              [Default=Undefined] optional boolean absolute);
 };