Move PlatformEventDispatcher implementations to the Oilpan heap.

Source/modules/device_orientation/DeviceMotionDispatcher.h

Index: Source/modules/device_orientation/DeviceMotionDispatcher.h
diff --git a/Source/modules/device_orientation/DeviceMotionDispatcher.h b/Source/modules/device_orientation/DeviceMotionDispatcher.h
index 9757abe3234e059fe3dc5d8f6b8df6e40e6c0ae5..05d40b1bdfb8b43b16e9938bc4e2ff2ae2a9d2b7 100644
--- a/Source/modules/device_orientation/DeviceMotionDispatcher.h
+++ b/Source/modules/device_orientation/DeviceMotionDispatcher.h
@@ -43,26 +43,29 @@ class DeviceMotionData;
 class WebDeviceMotionData;
 
 // This class listens to device motion data and notifies all registered controllers.
-class DeviceMotionDispatcher FINAL : public PlatformEventDispatcher, public WebDeviceMotionListener {
+class DeviceMotionDispatcher final : public GarbageCollectedFinalized<DeviceMotionDispatcher>, public PlatformEventDispatcher, public WebDeviceMotionListener {
+    USING_GARBAGE_COLLECTED_MIXIN(DeviceMotionDispatcher);
 public:
     static DeviceMotionDispatcher& instance();
+    virtual ~DeviceMotionDispatcher();
 
     // Note that the returned object is owned by this class.
     // FIXME: make the return value const, see crbug.com/233174.
     DeviceMotionData* latestDeviceMotionData();
 
     // Inherited from WebDeviceMotionListener.
-    virtual void didChangeDeviceMotion(const WebDeviceMotionData&) OVERRIDE;
+    virtual void didChangeDeviceMotion(const WebDeviceMotionData&) override;
+
+    virtual void trace(Visitor*) override;
 
 private:
     DeviceMotionDispatcher();
-    virtual ~DeviceMotionDispatcher();
 
     // Inherited from PlatformEventDispatcher.
-    virtual void startListening() OVERRIDE;
-    virtual void stopListening() OVERRIDE;
+    virtual void startListening() override;
+    virtual void stopListening() override;
 
-    Persistent<DeviceMotionData> m_lastDeviceMotionData;
+    Member<DeviceMotionData> m_lastDeviceMotionData;
 };
 
 } // namespace blink