remove append_from_srgb()

It's now no different than append(from_srgb).

Bug: skia:7419

Change-Id: I97c59b6987f033ec2f1859db40ca3056b87b370a
Reviewed-on: https://skia-review.googlesource.com/86741
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/src/shaders/SkImageShader.cpp b/src/shaders/SkImageShader.cpp
index fff59c7..ef13498 100644
--- a/src/shaders/SkImageShader.cpp
+++ b/src/shaders/SkImageShader.cpp
@@ -347,7 +347,7 @@
             default: SkASSERT(false);
         }
         if (rec.fDstCS && (!info.colorSpace() || info.gammaCloseToSRGB())) {
-            p->append_from_srgb(info.alphaType());
+            p->append(SkRasterPipeline::from_srgb);
         }
     };