Outline SkImageFilter Make methods

include/effects/SkBlurImageFilter.h

Index: include/effects/SkBlurImageFilter.h
diff --git a/include/effects/SkBlurImageFilter.h b/include/effects/SkBlurImageFilter.h
index 607e76de513e4fb8c92bf04921d5d836b275f6cc..9bfa19b8758c6785ff23ef0c7552ceb04782dacd 100644
--- a/include/effects/SkBlurImageFilter.h
+++ b/include/effects/SkBlurImageFilter.h
@@ -13,13 +13,9 @@
 
 class SK_API SkBlurImageFilter : public SkImageFilter {
 public:
-    static sk_sp<SkImageFilter> Make(SkScalar sigmaX, SkScalar sigmaY, sk_sp<SkImageFilter> input,
-                                     const CropRect* cropRect = nullptr) {
-        if (0 == sigmaX && 0 == sigmaY && nullptr == cropRect) {
-            return input;
-        }
-        return sk_sp<SkImageFilter>(new SkBlurImageFilter(sigmaX, sigmaY, input, cropRect));
-    }
+    static sk_sp<SkImageFilter> Make(SkScalar sigmaX, SkScalar sigmaY,
+                                     sk_sp<SkImageFilter> input,
+                                     const CropRect* cropRect = nullptr);
 
     SkRect computeFastBounds(const SkRect&) const override;