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

Source/platform/graphics/filters/FETile.h

Index: Source/platform/graphics/filters/FETile.h
diff --git a/Source/platform/graphics/filters/FETile.h b/Source/platform/graphics/filters/FETile.h
index 77a3c055bc69b90668381898f231655657f6f4d9..faf548351ea1acc7674a1ff9a8962f650c0a87ed 100644
--- a/Source/platform/graphics/filters/FETile.h
+++ b/Source/platform/graphics/filters/FETile.h
@@ -31,13 +31,13 @@ class PLATFORM_EXPORT FETile : public FilterEffect {
 public:
     static PassRefPtrWillBeRawPtr<FETile> create(Filter*);
 
-    virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) override;
+    PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) override;
 
-    virtual FloatRect mapPaintRect(const FloatRect&, bool forward = true) override final;
+    FloatRect mapPaintRect(const FloatRect&, bool forward = true) final;
 
-    virtual FilterEffectType filterEffectType() const override { return FilterEffectTypeTile; }
+    FilterEffectType filterEffectType() const override { return FilterEffectTypeTile; }
 
-    virtual TextStream& externalRepresentation(TextStream&, int indention) const override;
+    TextStream& externalRepresentation(TextStream&, int indention) const override;
 
 private:
     FETile(Filter*);