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

Source/platform/graphics/filters/SpotLightSource.h

Index: Source/platform/graphics/filters/SpotLightSource.h
diff --git a/Source/platform/graphics/filters/SpotLightSource.h b/Source/platform/graphics/filters/SpotLightSource.h
index 4ec89d63ccac58fdca43095530220599b087864d..636c906e823848717fc5e9e701f0bfe1e47e9f4e 100644
--- a/Source/platform/graphics/filters/SpotLightSource.h
+++ b/Source/platform/graphics/filters/SpotLightSource.h
@@ -36,7 +36,7 @@ public:
         return adoptRef(new SpotLightSource(position, direction, specularExponent, limitingConeAngle));
     }
 
-    virtual PassRefPtr<LightSource> create(const FloatPoint3D& scale, const FloatSize& offset) const override
+    PassRefPtr<LightSource> create(const FloatPoint3D& scale, const FloatSize& offset) const override
     {
         FloatPoint3D position(m_position.x() * scale.x() - offset.width(), m_position.y() * scale.y() - offset.height(), m_position.z() * scale.z());
         FloatPoint3D direction(m_direction.x() * scale.x() - offset.width(), m_direction.y() * scale.y() - offset.height(), m_direction.z() * scale.z());
@@ -48,13 +48,13 @@ public:
     float specularExponent() const { return m_specularExponent; }
     float limitingConeAngle() const { return m_limitingConeAngle; }
 
-    virtual bool setPosition(const FloatPoint3D&) override;
-    virtual bool setPointsAt(const FloatPoint3D&) override;
+    bool setPosition(const FloatPoint3D&) override;
+    bool setPointsAt(const FloatPoint3D&) override;
 
-    virtual bool setSpecularExponent(float) override;
-    virtual bool setLimitingConeAngle(float) override;
+    bool setSpecularExponent(float) override;
+    bool setLimitingConeAngle(float) override;
 
-    virtual TextStream& externalRepresentation(TextStream&) const override;
+    TextStream& externalRepresentation(TextStream&) const override;
 
 private:
     SpotLightSource(const FloatPoint3D& position, const FloatPoint3D& direction,