Updated Blink WebVR interfaces to WebVR v1 spec

third_party/WebKit/Source/modules/vr/PositionSensorVRDevice.idl

-// Copyright 2015 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.
-
-// An PositionSensorVRDevice represents a user interface that provides an
-// orientation and position in space. This may be a Head Mounted Display or
-// any number of other six-degree-of-freedom devices that provide, for example,
-// hand tracking.
-// http://mozvr.github.io/webvr-spec/webvr.html#positionsensorvrdevice
-[
-    RuntimeEnabled=WebVR,
-] interface PositionSensorVRDevice : VRDevice {
-    VRPositionState getState();
-    VRPositionState getImmediateState();
-    void resetSensor();
-};