Harmonize FilterEffect::mapRect and mapPaintRect

third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h

Index: third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h
diff --git a/third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h b/third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h
index 93eaf375563ba2c7a6dfab97c6d081a1e4c04aad..706f956fd0952a75580aa6146631fda67898d5df 100644
--- a/third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h
+++ b/third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h
@@ -30,17 +30,18 @@ class PLATFORM_EXPORT FEDropShadow final : public FilterEffect {
 public:
     static FEDropShadow* create(Filter*, float, float, float, float, const Color&, float);
 
-    FloatRect mapRect(const FloatRect&, bool forward = true) const final;
-
     void setShadowColor(const Color& color) { m_shadowColor = color; }
     void setShadowOpacity(float opacity) { m_shadowOpacity = opacity; }
 
     TextStream& externalRepresentation(TextStream&, int indention) const override;
-    sk_sp<SkImageFilter> createImageFilter() override;
 
 private:
     FEDropShadow(Filter*, float, float, float, float, const Color&, float);
 
+    FloatRect mapEffect(const FloatRect&) const override;
+
+    sk_sp<SkImageFilter> createImageFilter() override;
+
     float m_stdX;
     float m_stdY;
     float m_dx;