remove SK_SUPPORT_LEGACY_PIXELREF_UNFLATTENABLE code

src/ports/SkGlobalInitialization_default.cpp

Index: src/ports/SkGlobalInitialization_default.cpp
diff --git a/src/ports/SkGlobalInitialization_default.cpp b/src/ports/SkGlobalInitialization_default.cpp
index 5c693af13fbff4707c4d07518f4984bd4e83be39..a521b169212668e9b3c95c7d319ff14042a10962 100644
--- a/src/ports/SkGlobalInitialization_default.cpp
+++ b/src/ports/SkGlobalInitialization_default.cpp
@@ -106,9 +106,6 @@ static void InitializeFlattenables() {
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkMergeImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkColorFilterImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDownSampleImageFilter)
-#ifdef SK_SUPPORT_LEGACY_PIXELREF_UNFLATTENABLE
-    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkMallocPixelRef)
-#endif
 
     SkArithmeticMode::InitializeFlattenables();
     SkBlurMaskFilter::InitializeFlattenables();