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

Source/core/events/PointerEvent.h

Index: Source/core/events/PointerEvent.h
diff --git a/Source/core/events/PointerEvent.h b/Source/core/events/PointerEvent.h
index 187a4904158f6ebc16377309b023ae8945b16812..0445c6914916658e63a571e95a3144c57ea6a8cc 100644
--- a/Source/core/events/PointerEvent.h
+++ b/Source/core/events/PointerEvent.h
@@ -33,8 +33,8 @@ public:
     const String& pointerType() const { return m_pointerType; }
     bool isPrimary() const { return m_isPrimary; }
 
-    virtual bool isMouseEvent() const override;
-    virtual bool isPointerEvent() const override;
+    bool isMouseEvent() const override;
+    bool isPointerEvent() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
@@ -60,7 +60,7 @@ public:
 private:
     explicit PointerEventDispatchMediator(PassRefPtrWillBeRawPtr<PointerEvent>);
     PointerEvent& event() const;
-    virtual bool dispatchEvent(EventDispatcher&) const override;
+    bool dispatchEvent(EventDispatcher&) const override;
 };
 
 DEFINE_EVENT_TYPE_CASTS(PointerEvent);