[Sensors] Simplify calculation of the reporting period

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

 // Copyright 2017 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 OrientationSensor_h
 #define OrientationSensor_h
 
 #include "bindings/modules/v8/Float32ArrayOrFloat64ArrayOrDOMMatrix.h"
 #include "core/dom/DOMTypedArray.h"
 #include "modules/sensor/Sensor.h"
@@ skipping 12 matching lines @@
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   OrientationSensor(ExecutionContext*,
                     const SensorOptions&,
                     ExceptionState&,
                     device::mojom::blink::SensorType);
 
  private:
   // SensorProxy override.
-  void OnSensorReadingChanged(double timestamp) override;
+  void OnSensorReadingChanged() override;
   template <typename Matrix>
   void PopulateMatrixInternal(Matrix*, ExceptionState&);
 
   bool reading_dirty_;
 };
 
 }  // namespace blink
 
 #endif  // OrientationSensor_h