Fix virtual/override/final usage in the rest of Source/core/.

Source/core/frame/DeviceSingleWindowEventController.h

Index: Source/core/frame/DeviceSingleWindowEventController.h
diff --git a/Source/core/frame/DeviceSingleWindowEventController.h b/Source/core/frame/DeviceSingleWindowEventController.h
index 100cf54647faec4644ed8e082ac164cda5e90419..3dd2c423904eb838e42589277228d32d83fe83f3 100644
--- a/Source/core/frame/DeviceSingleWindowEventController.h
+++ b/Source/core/frame/DeviceSingleWindowEventController.h
@@ -20,13 +20,13 @@ public:
     virtual ~DeviceSingleWindowEventController();
 
     // Inherited from DeviceEventControllerBase.
-    virtual void didUpdateData() override;
+    void didUpdateData() override;
     DECLARE_VIRTUAL_TRACE();
 
     // Inherited from DOMWindowLifecycleObserver.
-    virtual void didAddEventListener(LocalDOMWindow*, const AtomicString&) override;
-    virtual void didRemoveEventListener(LocalDOMWindow*, const AtomicString&) override;
-    virtual void didRemoveAllEventListeners(LocalDOMWindow*) override;
+    void didAddEventListener(LocalDOMWindow*, const AtomicString&) override;
+    void didRemoveEventListener(LocalDOMWindow*, const AtomicString&) override;
+    void didRemoveAllEventListeners(LocalDOMWindow*) override;
 
 protected:
     explicit DeviceSingleWindowEventController(Document&);