remove unused "swap" stage

Change-Id: I25619f010f8ac6441529cfe8dff2d8c42d7400cf
Reviewed-on: https://skia-review.googlesource.com/20988
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/tests/SkRasterPipelineTest.cpp b/tests/SkRasterPipelineTest.cpp
index 014683c..4a951c0 100644
--- a/tests/SkRasterPipelineTest.cpp
+++ b/tests/SkRasterPipelineTest.cpp
@@ -21,10 +21,8 @@
     void* store_ctx  = &result;
 
     SkRasterPipeline_<256> p;
-    p.append(SkRasterPipeline::load_f16, &load_s_ctx);
-    p.append(SkRasterPipeline::move_src_dst);
-    p.append(SkRasterPipeline::load_f16, &load_d_ctx);
-    p.append(SkRasterPipeline::swap);
+    p.append(SkRasterPipeline::load_f16,     &load_s_ctx);
+    p.append(SkRasterPipeline::load_f16_dst, &load_d_ctx);
     p.append(SkRasterPipeline::srcover);
     p.append(SkRasterPipeline::store_f16, &store_ctx);
     p.run(0,0,1);