Remove some more GrColor references

Bug: skia:
Change-Id: I395395b1cd81a1d45ca779b2273015c8ed9fb882
Reviewed-on: https://skia-review.googlesource.com/c/168361
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/tests/ProcessorTest.cpp b/tests/ProcessorTest.cpp
index d0da21f..e76099c 100644
--- a/tests/ProcessorTest.cpp
+++ b/tests/ProcessorTest.cpp
@@ -576,8 +576,7 @@
                             }
                         }
                     }
-                    if (GrColorIsOpaque(input) && fp->preservesOpaqueInput() &&
-                        !GrColorIsOpaque(output)) {
+                    if (input4f.isOpaque() && fp->preservesOpaqueInput() && !output4f.isOpaque()) {
                         passing = false;
 
                         if (opaqueMessage.isEmpty()) {