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

Source/platform/fonts/SegmentedFontData.h

 /*
  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 39 matching lines @@
 private:
     UChar32 m_from;
     UChar32 m_to;
     RefPtr<SimpleFontData> m_fontData;
 };
 
 class PLATFORM_EXPORT SegmentedFontData : public FontData {
 public:
     static PassRefPtr<SegmentedFontData> create() { return adoptRef(new SegmentedFontData); }
 
-    virtual ~SegmentedFontData();
+    ~SegmentedFontData() override;
 
     void appendRange(const FontDataRange& range) { m_ranges.append(range); }
     unsigned numRanges() const { return m_ranges.size(); }
     const FontDataRange& rangeAt(unsigned i) const { return m_ranges[i]; }
     bool containsCharacter(UChar32) const;
 
 private:
     SegmentedFontData() { }
 
-    virtual const SimpleFontData* fontDataForCharacter(UChar32) const override;
+    const SimpleFontData* fontDataForCharacter(UChar32) const override;
 
-    virtual bool isCustomFont() const override;
-    virtual bool isLoading() const override;
-    virtual bool isLoadingFallback() const override;
-    virtual bool isSegmented() const override;
-    virtual bool shouldSkipDrawing() const override;
+    bool isCustomFont() const override;
+    bool isLoading() const override;
+    bool isLoadingFallback() const override;
+    bool isSegmented() const override;
+    bool shouldSkipDrawing() const override;
 
     Vector<FontDataRange, 1> m_ranges;
 };
 
 DEFINE_FONT_DATA_TYPE_CASTS(SegmentedFontData, true);
 
 } // namespace blink
 
 #endif // SegmentedFontData_h