Move PlatformEventDispatcher implementations to the Oilpan heap.

Source/modules/device_orientation/DeviceOrientationDispatcher.h

Index: Source/modules/device_orientation/DeviceOrientationDispatcher.h
diff --git a/Source/modules/device_orientation/DeviceOrientationDispatcher.h b/Source/modules/device_orientation/DeviceOrientationDispatcher.h
index 66bdd53516120d46507a774b1c718cdaa22190c6..4a75df9e11de199760ea889a135fdd4f5e70aaf1 100644
--- a/Source/modules/device_orientation/DeviceOrientationDispatcher.h
+++ b/Source/modules/device_orientation/DeviceOrientationDispatcher.h
@@ -43,26 +43,29 @@ 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