Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/SkColorCubeFilter.cpp

Index: src/effects/SkColorCubeFilter.cpp
diff --git a/src/effects/SkColorCubeFilter.cpp b/src/effects/SkColorCubeFilter.cpp
index 18c5b5603f39989c488b790f231723205b3942ce..30641c3c30ea26208ca3b9b6838bae5851c4e7fc 100644
--- a/src/effects/SkColorCubeFilter.cpp
+++ b/src/effects/SkColorCubeFilter.cpp
@@ -161,15 +161,6 @@ void SkColorCubeFilter::filterSpan(const SkPMColor src[], int count, SkPMColor d
     }
 }
 
-#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
-SkColorCubeFilter::SkColorCubeFilter(SkReadBuffer& buffer)
-  : fCache(buffer.readInt()) {
-    fCubeData.reset(buffer.readByteArrayAsData());
-    buffer.validate(is_valid_3D_lut(fCubeData, fCache.cubeDimension()));
-    fUniqueID = SkNextColorCubeUniqueID();
-}
-#endif
-
 SkFlattenable* SkColorCubeFilter::CreateProc(SkReadBuffer& buffer) {
     int cubeDimension = buffer.readInt();
     SkAutoDataUnref cubeData(buffer.readByteArrayAsData());