[Sensors] Align sensor reading attribute implementation with the specification

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

Index: third_party/WebKit/Source/modules/sensor/SensorReadingEventInit.idl
diff --git a/third_party/WebKit/Source/modules/sensor/SensorReadingEventInit.idl b/third_party/WebKit/Source/modules/sensor/SensorReadingEventInit.idl
deleted file mode 100644
index e3321009f4c049216afa7e47fb5b2620a0ef5e58..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/modules/sensor/SensorReadingEventInit.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/#dictdef-sensorreadingeventinit
-
-dictionary SensorReadingEventInit : EventInit {
-    // TODO(foolip): |reading| should be required and not nullable.
-    // https://crbug.com/647693
-    // https://github.com/w3c/sensors/issues/129
-    SensorReading? reading;
-};