Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/SkColorMatrixFilter.cpp

Index: src/effects/SkColorMatrixFilter.cpp
diff --git a/src/effects/SkColorMatrixFilter.cpp b/src/effects/SkColorMatrixFilter.cpp
index 20702920de202637315aa730cd16948416d047bc..27231b1466312402ae4930f34db39ed7ed85a79f 100644
--- a/src/effects/SkColorMatrixFilter.cpp
+++ b/src/effects/SkColorMatrixFilter.cpp
@@ -307,15 +307,6 @@ void SkColorMatrixFilter::flatten(SkWriteBuffer& buffer) const {
     buffer.writeScalarArray(fMatrix.fMat, 20);
 }
 
-#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
-SkColorMatrixFilter::SkColorMatrixFilter(SkReadBuffer& buffer) : INHERITED(buffer) {
-    SkASSERT(buffer.getArrayCount() == 20);
-    if (buffer.readScalarArray(fMatrix.fMat, 20)) {
-        this->initState(fMatrix.fMat);
-    }
-}
-#endif
-
 SkFlattenable* SkColorMatrixFilter::CreateProc(SkReadBuffer& buffer) {
     SkColorMatrix matrix;
     if (buffer.readScalarArray(matrix.fMat, 20)) {