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

Source/platform/graphics/BitmapPattern.h

Index: Source/platform/graphics/BitmapPattern.h
diff --git a/Source/platform/graphics/BitmapPattern.h b/Source/platform/graphics/BitmapPattern.h
index 8726156dbba726a9452380555fc3417e92613641..3fcdfdaa27565d7e86576e748853081d3e9587ce 100644
--- a/Source/platform/graphics/BitmapPattern.h
+++ b/Source/platform/graphics/BitmapPattern.h
@@ -17,13 +17,13 @@ public:
         return adoptRef(new BitmapPattern(tileImage, repeatMode));
     }
 
-    virtual ~BitmapPattern() { }
+    ~BitmapPattern() override {}
 
 protected:
-    virtual PassRefPtr<SkShader> createShader() override;
+    PassRefPtr<SkShader> createShader() override;
 
-    virtual SkImageInfo getBitmapInfo() override;
-    virtual void drawBitmapToCanvas(SkCanvas&, SkPaint&) override;
+    SkImageInfo getBitmapInfo() override;
+    void drawBitmapToCanvas(SkCanvas&, SkPaint&) override;
 
 private:
     BitmapPattern(PassRefPtr<Image>, RepeatMode);