[Sensors] Align sensor reading attribute implementation with the specification

third_party/WebKit/Source/modules/sensor/SensorReadingEvent.idl

Index: third_party/WebKit/Source/modules/sensor/SensorReadingEvent.idl
diff --git a/third_party/WebKit/Source/modules/sensor/SensorReadingEvent.idl b/third_party/WebKit/Source/modules/sensor/SensorReadingEvent.idl
deleted file mode 100644
index 004c527ddbd89a5d6cd10a644563f97d659ea194..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/modules/sensor/SensorReadingEvent.idl
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2016 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.
-
-// Specification at:
-// https://w3c.github.io/sensors/#sensorreadingevent
-
-[
-    RuntimeEnabled=Sensor,
-    Constructor(DOMString type, SensorReadingEventInit eventInitDict)
-] interface SensorReadingEvent : Event {
-    readonly attribute SensorReading reading;
-};