move common blur types into central header

src/effects/SkEmbossMaskFilter.cpp

Index: src/effects/SkEmbossMaskFilter.cpp
diff --git a/src/effects/SkEmbossMaskFilter.cpp b/src/effects/SkEmbossMaskFilter.cpp
index 19725f1a2e86b065e6a61d6dc3b17932b0d26ace..9bf5025e702b223ac52ce97ff828a1dbad504000 100644
--- a/src/effects/SkEmbossMaskFilter.cpp
+++ b/src/effects/SkEmbossMaskFilter.cpp
@@ -76,8 +76,7 @@ bool SkEmbossMaskFilter::filterMask(SkMask* dst, const SkMask& src,
                                     const SkMatrix& matrix, SkIPoint* margin) const {
     SkScalar sigma = matrix.mapRadius(fBlurSigma);
 
-    if (!SkBlurMask::BoxBlur(dst, src, sigma, SkBlurMask::kInner_Style,
-                             SkBlurMask::kLow_Quality)) {
+    if (!SkBlurMask::BoxBlur(dst, src, sigma, kInner_SkBlurStyle, kLow_SkBlurQuality)) {
         return false;
     }