[Sensors] Align sensor reading attribute implementation with the specification

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"
 
@@ skipping 16 matching lines @@
 
 AmbientLightSensor::AmbientLightSensor(ScriptState* scriptState,
                                        const SensorOptions& options,
                                        ExceptionState& exceptionState)
     : Sensor(scriptState, options, exceptionState, SensorType::AMBIENT_LIGHT) {}
 
 AmbientLightSensorReading* AmbientLightSensor::reading() const {
   return static_cast<AmbientLightSensorReading*>(Sensor::reading());
 }
 
-SensorReading* AmbientLightSensor::createSensorReading(SensorProxy* proxy) {
-  return AmbientLightSensorReading::create(proxy);
+std::unique_ptr<SensorReadingFactory>
+AmbientLightSensor::createSensorReadingFactory() {
+  return std::unique_ptr<SensorReadingFactory>(
+      new SensorReadingFactoryImpl<AmbientLightSensorReading>());
 }
 
 auto AmbientLightSensor::createSensorConfig(
     const SensorOptions& options,
     const SensorConfiguration& defaultConfig) -> SensorConfigurationPtr {
   auto result = device::mojom::blink::SensorConfiguration::New();
   result->frequency =
       options.hasFrequency() ? options.frequency() : defaultConfig.frequency;
   return result;
 }
 
 DEFINE_TRACE(AmbientLightSensor) {
   Sensor::trace(visitor);
 }
 
 }  // namespace blink