Move PlatformEventDispatcher implementations to the Oilpan heap.

Source/modules/device_orientation/DeviceOrientationDispatcher.h

 /*
  * 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 25 matching lines @@
 #include "public/platform/WebDeviceOrientationListener.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class DeviceOrientationController;
 class DeviceOrientationData;
 class WebDeviceOrientationData;
 
 // This class listens to device orientation data and notifies all registered controllers.
-class DeviceOrientationDispatcher : public PlatformEventDispatcher, public WebDeviceOrientationListener {
+class DeviceOrientationDispatcher final : public GarbageCollectedFinalized<DeviceOrientationDispatcher>, public PlatformEventDispatcher, public WebDeviceOrientationListener {
+    USING_GARBAGE_COLLECTED_MIXIN(DeviceOrientationDispatcher);
 public:
     static DeviceOrientationDispatcher& instance();
+    virtual ~DeviceOrientationDispatcher();
 
     // Note that the returned object is owned by this class.
     // FIXME: make the return value const, see crbug.com/233174.
     DeviceOrientationData* latestDeviceOrientationData();
 
     // Inherited from WebDeviceOrientationListener.
-    virtual void didChangeDeviceOrientation(const WebDeviceOrientationData&) OVERRIDE;
+    virtual void didChangeDeviceOrientation(const WebDeviceOrientationData&) override;
+
+    virtual void trace(Visitor*) override;
 
 private:
     DeviceOrientationDispatcher();
-    ~DeviceOrientationDispatcher();
 
     // Inherited from PlatformEventDispatcher.
-    virtual void startListening() OVERRIDE;
-    virtual void stopListening() OVERRIDE;
+    virtual void startListening() override;
+    virtual void stopListening() override;
 
-    Persistent<DeviceOrientationData> m_lastDeviceOrientationData;
+    Member<DeviceOrientationData> m_lastDeviceOrientationData;
 };
 
 } // namespace blink
 
 #endif // DeviceOrientationDispatcher_h