remove SK_SUPPORT_LEGACY_REFENCODEDDATA_NOCTX flag

BUG=skia:

Change-Id: I51b7778db8b596b2633b6be9488af984cee2af70
Reviewed-on: https://skia-review.googlesource.com/5713
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
diff --git a/src/codec/SkCodecImageGenerator.cpp b/src/codec/SkCodecImageGenerator.cpp
index 9f85971..447332b 100644
--- a/src/codec/SkCodecImageGenerator.cpp
+++ b/src/codec/SkCodecImageGenerator.cpp
@@ -30,7 +30,7 @@
     , fData(std::move(data))
 {}
 
-SkData* SkCodecImageGenerator::onRefEncodedData(SK_REFENCODEDDATA_CTXPARAM) {
+SkData* SkCodecImageGenerator::onRefEncodedData(GrContext* ctx) {
     return SkRef(fData.get());
 }