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

Source/core/frame/DeviceSingleWindowEventController.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DeviceSingleWindowEventController_h
 #define DeviceSingleWindowEventController_h
 
 #include "core/CoreExport.h"
 #include "core/frame/DOMWindowLifecycleObserver.h"
 #include "core/frame/PlatformEventController.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Document;
 class Event;
 
 class CORE_EXPORT DeviceSingleWindowEventController : public NoBaseWillBeGarbageCollectedFinalized<DeviceSingleWindowEventController>, public PlatformEventController, public DOMWindowLifecycleObserver {
 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&);
 
     Document& document() const { return *m_document; }
 
     void dispatchDeviceEvent(const PassRefPtrWillBeRawPtr<Event>);
 
     virtual PassRefPtrWillBeRawPtr<Event> lastEvent() const = 0;
     virtual const AtomicString& eventTypeName() const = 0;
     virtual bool isNullEvent(Event*) const = 0;
 
 private:
     bool m_needsCheckingNullEvents;
     RawPtrWillBeMember<Document> m_document;
 };
 
 } // namespace blink
 
 #endif // DeviceSingleWindowEventController_h