Fix virtual/override/final usage in Source/modules/.

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 a83917cbe9d150f892b40dbd86b1f59151cd353e..1a0322a053d075fa8a4489ae09fc1c31f9a91689 100644
--- a/Source/modules/device_orientation/DeviceOrientationDispatcher.h
+++ b/Source/modules/device_orientation/DeviceOrientationDispatcher.h
@@ -46,14 +46,14 @@ class DeviceOrientationDispatcher final : public GarbageCollectedFinalized<Devic
     USING_GARBAGE_COLLECTED_MIXIN(DeviceOrientationDispatcher);
 public:
     static DeviceOrientationDispatcher& instance();
-    virtual ~DeviceOrientationDispatcher();
+    ~DeviceOrientationDispatcher() override;
 
     // 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;
+    void didChangeDeviceOrientation(const WebDeviceOrientationData&) override;
 
     DECLARE_VIRTUAL_TRACE();
 
@@ -61,8 +61,8 @@ private:
     DeviceOrientationDispatcher();
 
     // Inherited from PlatformEventDispatcher.
-    virtual void startListening() override;
-    virtual void stopListening() override;
+    void startListening() override;
+    void stopListening() override;
 
     Member<DeviceOrientationData> m_lastDeviceOrientationData;
 };