Fix virtual/override/final usage in Source/core/{animation,css,style}/.

Source/core/css/LocalFontFaceSource.h

Index: Source/core/css/LocalFontFaceSource.h
diff --git a/Source/core/css/LocalFontFaceSource.h b/Source/core/css/LocalFontFaceSource.h
index e2ad06983b77eb4041cb27d37d23d0469fb6ede5..6e90667274b6e619d3184d873fdadf0d42231cfc 100644
--- a/Source/core/css/LocalFontFaceSource.h
+++ b/Source/core/css/LocalFontFaceSource.h
@@ -13,11 +13,11 @@ namespace blink {
 class LocalFontFaceSource final : public CSSFontFaceSource {
 public:
     LocalFontFaceSource(const String& fontName) : m_fontName(fontName) { }
-    virtual bool isLocal() const override { return true; }
-    virtual bool isLocalFontAvailable(const FontDescription&) override;
+    bool isLocal() const override { return true; }
+    bool isLocalFontAvailable(const FontDescription&) override;
 
 private:
-    virtual PassRefPtr<SimpleFontData> createFontData(const FontDescription&) override;
+    PassRefPtr<SimpleFontData> createFontData(const FontDescription&) override;
 
     class LocalFontHistograms {
     public: