[Sensors] Remove SensorReading interfaces

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

 // 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.
 
 #ifndef AmbientLightSensor_h
 #define AmbientLightSensor_h
 
 #include "modules/sensor/Sensor.h"
 
 namespace blink {
 
-class AmbientLightSensorReading;
-
 class AmbientLightSensor final : public Sensor {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static AmbientLightSensor* create(ExecutionContext*,
                                     const SensorOptions&,
                                     ExceptionState&);
   static AmbientLightSensor* create(ExecutionContext*, ExceptionState&);
 
-  AmbientLightSensorReading* reading() const;
+  double illuminance(bool& isNull) const;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   AmbientLightSensor(ExecutionContext*, const SensorOptions&, ExceptionState&);
-  // Sensor overrides.
-  std::unique_ptr<SensorReadingFactory> createSensorReadingFactory() override;
 };
 
 }  // namespace blink
 
 #endif  // AmbientLightSensor_h