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

Source/platform/graphics/paint/ClipPathDisplayItem.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 ClipPathDisplayItem_h
 #define ClipPathDisplayItem_h
 
 #include "platform/PlatformExport.h"
 #include "platform/graphics/Path.h"
 #include "platform/graphics/paint/DisplayItem.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT BeginClipPathDisplayItem : public PairedBeginDisplayItem {
 public:
     BeginClipPathDisplayItem(const DisplayItemClientWrapper& client, const Path& clipPath)
         : PairedBeginDisplayItem(client, BeginClipPath)
         , m_clipPath(clipPath.skPath()) { }
 
-    virtual void replay(GraphicsContext&) override;
-    virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
+    void replay(GraphicsContext&) override;
+    void appendToWebDisplayItemList(WebDisplayItemList*) const override;
 
 private:
     const SkPath m_clipPath;
 #ifndef NDEBUG
-    virtual void dumpPropertiesAsDebugString(WTF::StringBuilder&) const override;
+    void dumpPropertiesAsDebugString(WTF::StringBuilder&) const override;
 #endif
 };
 
 class PLATFORM_EXPORT EndClipPathDisplayItem : public PairedEndDisplayItem {
 public:
     EndClipPathDisplayItem(const DisplayItemClientWrapper& client)
         : PairedEndDisplayItem(client, EndClipPath) { }
 
-    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 otherType == BeginClipPath; }
+    bool isEndAndPairedWith(DisplayItem::Type otherType) const final { return otherType == BeginClipPath; }
 #endif
 };
 
 } // namespace blink
 
 #endif // ClipPathDisplayItem_h