Fix virtual/override/final usage in Source/core/html/.

Source/core/html/canvas/CanvasRenderingContext2DState.h

 // Copyright 2015 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 CanvasRenderingContext2DState_h
 #define CanvasRenderingContext2DState_h
 
 #include "core/css/CSSFontSelectorClient.h"
 #include "core/html/canvas/ClipList.h"
 #include "platform/fonts/Font.h"
 #include "platform/transforms/AffineTransform.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class CanvasStyle;
 class CSSValue;
 class Element;
 
 class CanvasRenderingContext2DState final : public NoBaseWillBeGarbageCollectedFinalized<CanvasRenderingContext2DState>, public CSSFontSelectorClient {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(CanvasRenderingContext2DState);
 public:
     static PassOwnPtrWillBeRawPtr<CanvasRenderingContext2DState> create()
     {
         return adoptPtrWillBeNoop(new CanvasRenderingContext2DState);
     }
 
-    virtual ~CanvasRenderingContext2DState();
+    ~CanvasRenderingContext2DState() override;
 
     DECLARE_VIRTUAL_TRACE();
 
     enum ClipListCopyMode {
         CopyClipList,
         DontCopyClipList
     };
 
     enum PaintType {
         FillPaintType,
         StrokePaintType,
         ImagePaintType,
     };
 
     static PassOwnPtrWillBeRawPtr<CanvasRenderingContext2DState> create(const CanvasRenderingContext2DState& other, ClipListCopyMode mode)
     {
         return adoptPtrWillBeNoop(new CanvasRenderingContext2DState(other, mode));
     }
     CanvasRenderingContext2DState& operator=(const CanvasRenderingContext2DState&);
 
     // CSSFontSelectorClient implementation
-    virtual void fontsNeedUpdate(CSSFontSelector*) override;
+    void fontsNeedUpdate(CSSFontSelector*) override;
 
     bool hasUnrealizedSaves() const { return m_unrealizedSaveCount; }
     void save() { ++m_unrealizedSaveCount; }
     void restore() { --m_unrealizedSaveCount; }
     void resetUnrealizedSaveCount() { m_unrealizedSaveCount = 0; }
 
     void setLineDash(const Vector<float>&);
     const Vector<float>& lineDash() const { return m_lineDash; }
 
     void setShouldAntialias(bool);
@@ skipping 154 matching lines @@
     mutable bool m_fillStyleDirty : 1;
     mutable bool m_strokeStyleDirty : 1;
     mutable bool m_lineDashDirty : 1;
 
     ClipList m_clipList;
 };
 
 } // blink
 
 #endif