[Sensors] Remove SensorReading interfaces

third_party/WebKit/Source/modules/sensor/AmbientLightSensor.cpp

 // 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.
 
 #include "modules/sensor/AmbientLightSensor.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
-#include "modules/sensor/AmbientLightSensorReading.h"
 
 using device::mojom::blink::SensorType;
 
 namespace blink {
 
 // static
 AmbientLightSensor* AmbientLightSensor::create(
     ExecutionContext* executionContext,
     const SensorOptions& options,
     ExceptionState& exceptionState) {
   return new AmbientLightSensor(executionContext, options, exceptionState);
 }
 
 // static
 AmbientLightSensor* AmbientLightSensor::create(
     ExecutionContext* executionContext,
     ExceptionState& exceptionState) {
   return create(executionContext, SensorOptions(), exceptionState);
 }
 
 AmbientLightSensor::AmbientLightSensor(ExecutionContext* executionContext,
                                        const SensorOptions& options,
                                        ExceptionState& exceptionState)
     : Sensor(executionContext,
              options,
              exceptionState,
              SensorType::AMBIENT_LIGHT) {}
 
-AmbientLightSensorReading* AmbientLightSensor::reading() const {
-  return static_cast<AmbientLightSensorReading*>(Sensor::reading());
-}
-
-std::unique_ptr<SensorReadingFactory>
-AmbientLightSensor::createSensorReadingFactory() {
-  return std::unique_ptr<SensorReadingFactory>(
-      new SensorReadingFactoryImpl<AmbientLightSensorReading>());
+double AmbientLightSensor::illuminance(bool& isNull) const {
+  return readingValue(0, isNull);
 }
 
 DEFINE_TRACE(AmbientLightSensor) {
   Sensor::trace(visitor);
 }
 
 }  // namespace blink