Move PlatformEventDispatcher implementations to the Oilpan heap.

Source/modules/device_orientation/DeviceOrientationDispatcher.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 33 matching lines @@
 }
 
 DeviceOrientationDispatcher::DeviceOrientationDispatcher()
 {
 }
 
 DeviceOrientationDispatcher::~DeviceOrientationDispatcher()
 {
 }
 
+void DeviceOrientationDispatcher::trace(Visitor* visitor)
+{
+    visitor->trace(m_lastDeviceOrientationData);
+    PlatformEventDispatcher::trace(visitor);
+}
+
 void DeviceOrientationDispatcher::startListening()
 {
     Platform::current()->startListening(WebPlatformEventDeviceOrientation, this);
 }
 
 void DeviceOrientationDispatcher::stopListening()
 {
     Platform::current()->stopListening(WebPlatformEventDeviceOrientation);
     m_lastDeviceOrientationData.clear();
 }
 
 void DeviceOrientationDispatcher::didChangeDeviceOrientation(const WebDeviceOrientationData& motion)
 {
     m_lastDeviceOrientationData = DeviceOrientationData::create(motion);
     notifyControllers();
 }
 
 DeviceOrientationData* DeviceOrientationDispatcher::latestDeviceOrientationData()
 {
     return m_lastDeviceOrientationData.get();
 }
 
 } // namespace blink