Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/SkMatrixImageFilter.cpp

Index: src/effects/SkMatrixImageFilter.cpp
diff --git a/src/effects/SkMatrixImageFilter.cpp b/src/effects/SkMatrixImageFilter.cpp
index 8b07dd4a467833ba290dc97474fb1f9b799c4b45..919dff3994f3d822443c5601f47ed2a8dd6cd41f 100644
--- a/src/effects/SkMatrixImageFilter.cpp
+++ b/src/effects/SkMatrixImageFilter.cpp
@@ -31,14 +31,6 @@ SkMatrixImageFilter* SkMatrixImageFilter::Create(const SkMatrix& transform,
     return SkNEW_ARGS(SkMatrixImageFilter, (transform, filterLevel, input, uniqueID));
 }
 
-#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
-SkMatrixImageFilter::SkMatrixImageFilter(SkReadBuffer& buffer)
-  : INHERITED(1, buffer) {
-    buffer.readMatrix(&fTransform);
-    fFilterLevel = static_cast<SkPaint::FilterLevel>(buffer.readInt());
-}
-#endif
-
 SkFlattenable* SkMatrixImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
     SkMatrix matrix;