Revert of Moving SkBlurImageFilter into core

include/effects/SkBlurImageFilter.h

Index: include/effects/SkBlurImageFilter.h
diff --git a/include/effects/SkBlurImageFilter.h b/include/effects/SkBlurImageFilter.h
index 085a13b5b328a9ea9940e50702454321fe4e6ce9..9bfa19b8758c6785ff23ef0c7552ceb04782dacd 100644
--- a/include/effects/SkBlurImageFilter.h
+++ b/include/effects/SkBlurImageFilter.h
@@ -9,14 +9,40 @@
 #define SkBlurImageFilter_DEFINED
 
 #include "SkImageFilter.h"
+#include "SkSize.h"
 
-class SK_API SkBlurImageFilter {
+class SK_API SkBlurImageFilter : public SkImageFilter {
 public:
     static sk_sp<SkImageFilter> Make(SkScalar sigmaX, SkScalar sigmaY,
                                      sk_sp<SkImageFilter> input,
-                                     const SkImageFilter::CropRect* cropRect = nullptr) {
-        return SkImageFilter::MakeBlur(sigmaX, sigmaY, input, cropRect);
+                                     const CropRect* cropRect = nullptr);
+
+    SkRect computeFastBounds(const SkRect&) const override;
+
+    SK_TO_STRING_OVERRIDE()
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurImageFilter)
+
+#ifdef SK_SUPPORT_LEGACY_IMAGEFILTER_PTR
+    static SkImageFilter* Create(SkScalar sigmaX, SkScalar sigmaY, SkImageFilter* input = nullptr,
+                                 const CropRect* cropRect = nullptr) {
+        return Make(sigmaX, sigmaY, sk_ref_sp<SkImageFilter>(input), cropRect).release();
     }
+#endif
+
+protected:
+    void flatten(SkWriteBuffer&) const override;
+    sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&,
+                                        SkIPoint* offset) const override;
+    SkIRect onFilterNodeBounds(const SkIRect& src, const SkMatrix&, MapDirection) const override;
+
+private:
+    SkBlurImageFilter(SkScalar sigmaX,
+                      SkScalar sigmaY,
+                      sk_sp<SkImageFilter> input,
+                      const CropRect* cropRect);
+
+    SkSize   fSigma;
+    typedef SkImageFilter INHERITED;
 };
 
 #endif