Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/SkBlurImageFilter.cpp

Index: src/effects/SkBlurImageFilter.cpp
diff --git a/src/effects/SkBlurImageFilter.cpp b/src/effects/SkBlurImageFilter.cpp
index 4166d200355632e6ef8374ac4eb018e7460519a8..e5bb8c1e74592ef7db9a5e77ae5341d73bf6f644 100644
--- a/src/effects/SkBlurImageFilter.cpp
+++ b/src/effects/SkBlurImageFilter.cpp
@@ -31,18 +31,6 @@ static SkVector mapSigma(const SkSize& localSigma, const SkMatrix& ctm) {
     return sigma;
 }
 
-#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
-SkBlurImageFilter::SkBlurImageFilter(SkReadBuffer& buffer)
-  : INHERITED(1, buffer) {
-    fSigma.fWidth = buffer.readScalar();
-    fSigma.fHeight = buffer.readScalar();
-    buffer.validate(SkScalarIsFinite(fSigma.fWidth) &&
-                    SkScalarIsFinite(fSigma.fHeight) &&
-                    (fSigma.fWidth >= 0) &&
-                    (fSigma.fHeight >= 0));
-}
-#endif
-
 SkBlurImageFilter::SkBlurImageFilter(SkScalar sigmaX,
                                      SkScalar sigmaY,
                                      SkImageFilter* input,