[sensors] Align Accelerometer interface with the specification

third_party/WebKit/Source/modules/sensor/Accelerometer.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 Accelerometer_h
 #define Accelerometer_h
 
-#include "modules/sensor/AccelerometerOptions.h"
 #include "modules/sensor/Sensor.h"
 
 namespace blink {
 
 class Accelerometer final : public Sensor {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static Accelerometer* create(ExecutionContext*,
-                               const AccelerometerOptions&,
+                               const SensorOptions&,
                                ExceptionState&);
   static Accelerometer* create(ExecutionContext*, ExceptionState&);
 
   double x(bool& isNull) const;
   double y(bool& isNull) const;
   double z(bool& isNull) const;
-  bool includesGravity() const;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
-  Accelerometer(ExecutionContext*,
-                const AccelerometerOptions&,
-                ExceptionState&);
-  // Sensor overrides.
-  AccelerometerOptions m_accelerometerOptions;
+  Accelerometer(ExecutionContext*, const SensorOptions&, ExceptionState&);
 };
 
 }  // namespace blink
 
 #endif  // Accelerometer_h