This CL clean up patch in DeviceMotionEvent.

Source/modules/device_orientation/DeviceMotionEvent.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 45 matching lines @@
     m_deviceMotionData = deviceMotionData;
 
     m_acceleration.clear();
     m_accelerationIncludingGravity.clear();
     m_rotationRate.clear();
 }
 
 DeviceAcceleration* DeviceMotionEvent::acceleration()
 {
     if (!m_deviceMotionData->acceleration())
-        return 0;
+        return nullptr;
 
     if (!m_acceleration)
         m_acceleration = DeviceAcceleration::create(m_deviceMotionData->acceleration());
 
     return m_acceleration.get();
 }
 
 DeviceAcceleration* DeviceMotionEvent::accelerationIncludingGravity()
 {
     if (!m_deviceMotionData->accelerationIncludingGravity())
-        return 0;
+        return nullptr;
 
     if (!m_accelerationIncludingGravity)
         m_accelerationIncludingGravity = DeviceAcceleration::create(m_deviceMotionData->accelerationIncludingGravity());
 
     return m_accelerationIncludingGravity.get();
 }
 
 DeviceRotationRate* DeviceMotionEvent::rotationRate()
 {
     if (!m_deviceMotionData->rotationRate())
-        return 0;
+        return nullptr;
 
     if (!m_rotationRate)
         m_rotationRate = DeviceRotationRate::create(m_deviceMotionData->rotationRate());
 
     return m_rotationRate.get();
 }
 
 double DeviceMotionEvent::interval(bool& isNull) const
 {
     if (m_deviceMotionData->canProvideInterval())
@@ skipping 11 matching lines @@
 DEFINE_TRACE(DeviceMotionEvent)
 {
     visitor->trace(m_deviceMotionData);
     visitor->trace(m_acceleration);
     visitor->trace(m_accelerationIncludingGravity);
     visitor->trace(m_rotationRate);
     Event::trace(visitor);
 }
 
 } // namespace blink