Finish removing GrContext param from onRefEncodedData

TBR=reed@roogle.com

Bug: skia:5485
Change-Id: Ia4ed45ffc39f2ba9a80d4a1001208079142ae985
Reviewed-on: https://skia-review.googlesource.com/14323
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/src/codec/SkCodecImageGenerator.h b/src/codec/SkCodecImageGenerator.h
index 2332164..832a7f3 100644
--- a/src/codec/SkCodecImageGenerator.h
+++ b/src/codec/SkCodecImageGenerator.h
@@ -21,11 +21,7 @@
     static std::unique_ptr<SkImageGenerator> MakeFromEncodedCodec(sk_sp<SkData>);
 
 protected:
-    SkData* onRefEncodedData(
-#ifdef SK_SUPPORT_GPU_REF_ENCODED_DATA
-        GrContext* ctx
-#endif
-    ) override;
+    SkData* onRefEncodedData() override;
 
     bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, SkPMColor ctable[],
                      int* ctableCount) override;