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

Source/platform/graphics/paint/ClipDisplayItem.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 ClipDisplayItem_h
 #define ClipDisplayItem_h
 
 #include "SkRegion.h"
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatRoundedRect.h"
@@ skipping 12 matching lines @@
     {
         ASSERT(isClipType(type));
     }
 
     ClipDisplayItem(const DisplayItemClientWrapper& client, Type type, const IntRect& clipRect, Vector<FloatRoundedRect>& roundedRectClips)
         : ClipDisplayItem(client, type, clipRect)
     {
         m_roundedRectClips.swap(roundedRectClips);
     }
 
-    virtual void replay(GraphicsContext&) override;
-    virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
+    void replay(GraphicsContext&) override;
+    void appendToWebDisplayItemList(WebDisplayItemList*) const override;
 
 private:
 #ifndef NDEBUG
-    virtual void dumpPropertiesAsDebugString(WTF::StringBuilder&) const override;
+    void dumpPropertiesAsDebugString(WTF::StringBuilder&) const override;
 #endif
     const IntRect m_clipRect;
     Vector<FloatRoundedRect> m_roundedRectClips;
 };
 
 class PLATFORM_EXPORT EndClipDisplayItem : public PairedEndDisplayItem {
 public:
     EndClipDisplayItem(const DisplayItemClientWrapper& client, Type type)
         : PairedEndDisplayItem(client, type)
     {
         ASSERT(isEndClipType(type));
     }
 
-    virtual void replay(GraphicsContext&) override;
-    virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
+    void replay(GraphicsContext&) override;
+    void appendToWebDisplayItemList(WebDisplayItemList*) const override;
 
 private:
 #if ENABLE(ASSERT)
-    virtual bool isEndAndPairedWith(DisplayItem::Type otherType) const override final { return DisplayItem::isClipType(otherType); }
+    bool isEndAndPairedWith(DisplayItem::Type otherType) const final { return DisplayItem::isClipType(otherType); }
 #endif
 };
 
 } // namespace blink
 
 #endif // ClipDisplayItem_h