Harmonize FilterEffect::mapRect and mapPaintRect

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

Index: third_party/WebKit/Source/platform/graphics/filters/FEOffset.h
diff --git a/third_party/WebKit/Source/platform/graphics/filters/FEOffset.h b/third_party/WebKit/Source/platform/graphics/filters/FEOffset.h
index 17d1bcbcb402a8e89097ee3830c06eb076316895..a9c8376db49e271c777b537436768a9be537ab8f 100644
--- a/third_party/WebKit/Source/platform/graphics/filters/FEOffset.h
+++ b/third_party/WebKit/Source/platform/graphics/filters/FEOffset.h
@@ -37,13 +37,13 @@ public:
     float dy() const;
     void setDy(float);
 
-    FloatRect mapRect(const FloatRect&, bool forward = true) const final;
-
     TextStream& externalRepresentation(TextStream&, int indention) const override;
 
 private:
     FEOffset(Filter*, float dx, float dy);
 
+    FloatRect mapEffect(const FloatRect&) const override;
+
     sk_sp<SkImageFilter> createImageFilter() override;
 
     float m_dx;