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

Source/platform/graphics/filters/FEColorMatrix.h

Index: Source/platform/graphics/filters/FEColorMatrix.h
diff --git a/Source/platform/graphics/filters/FEColorMatrix.h b/Source/platform/graphics/filters/FEColorMatrix.h
index 469621cf70bbc18c42ad8edb29a42cbc28021b4b..e072e9896bdb04bcf7340268164b11bded0f3289 100644
--- a/Source/platform/graphics/filters/FEColorMatrix.h
+++ b/Source/platform/graphics/filters/FEColorMatrix.h
@@ -46,9 +46,9 @@ public:
     const Vector<float>& values() const;
     bool setValues(const Vector<float>&);
 
-    virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) override;
+    PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) override;
 
-    virtual TextStream& externalRepresentation(TextStream&, int indention) const override;
+    TextStream& externalRepresentation(TextStream&, int indention) const override;
 
     static inline void calculateSaturateComponents(float* components, float value);
     static inline void calculateHueRotateComponents(float* components, float value);
@@ -56,7 +56,7 @@ public:
 private:
     FEColorMatrix(Filter*, ColorMatrixType, const Vector<float>&);
 
-    virtual bool affectsTransparentPixels() override;
+    bool affectsTransparentPixels() override;
 
     ColorMatrixType m_type;