Switch SkBlurImageFilter over to new onFilterImage interface

include/effects/SkBlurImageFilter.h

Index: include/effects/SkBlurImageFilter.h
diff --git a/include/effects/SkBlurImageFilter.h b/include/effects/SkBlurImageFilter.h
index 6612b212cc3ed8839139787e8624bbf293854f25..b2cba514db90a1261b31fcaf0cb23ad441a07bae 100644
--- a/include/effects/SkBlurImageFilter.h
+++ b/include/effects/SkBlurImageFilter.h
@@ -28,13 +28,12 @@ public:
 
 protected:
     void flatten(SkWriteBuffer&) const override;
-    bool onFilterImageDeprecated(Proxy*, const SkBitmap& src, const Context&, SkBitmap* result,
-                                 SkIPoint* offset) const override;
+
+    SkSpecialImage* onFilterImage(SkSpecialImage* source, const Context&,
+                                  SkIPoint* offset) const override;
+
     void onFilterNodeBounds(const SkIRect& src, const SkMatrix&,
                             SkIRect* dst, MapDirection) const override;
-    bool canFilterImageGPU() const override { return true; }
-    bool filterImageGPUDeprecated(Proxy* proxy, const SkBitmap& src, const Context& ctx,
-                                  SkBitmap* result, SkIPoint* offset) const override;
 
 private:
     SkBlurImageFilter(SkScalar sigmaX,