[Sensors] Simplify calculation of the reporting period

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

 // 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.
 
 #include "modules/sensor/OrientationSensor.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/geometry/DOMMatrix.h"
 
 using device::mojom::blink::SensorType;
@@ skipping 109 matching lines @@
   return reading_dirty_ || !CanReturnReadings();
 }
 
 OrientationSensor::OrientationSensor(ExecutionContext* execution_context,
                                      const SensorOptions& options,
                                      ExceptionState& exception_state,
                                      device::mojom::blink::SensorType type)
     : Sensor(execution_context, options, exception_state, type),
       reading_dirty_(true) {}
 
-void OrientationSensor::OnSensorReadingChanged(double timestamp) {
+void OrientationSensor::OnSensorReadingChanged() {
   reading_dirty_ = true;
-  Sensor::OnSensorReadingChanged(timestamp);
+  Sensor::OnSensorReadingChanged();
 }
 
 DEFINE_TRACE(OrientationSensor) {
   Sensor::Trace(visitor);
 }
 
 }  // namespace blink