Make GrBlend.h private

Change-Id: I77f3dbc80d85d3a19e8986dae42450ee5b8c07a7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/234668
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/tests/AdvancedBlendTest.cpp b/tests/AdvancedBlendTest.cpp
index 8af145c..176bf83 100644
--- a/tests/AdvancedBlendTest.cpp
+++ b/tests/AdvancedBlendTest.cpp
@@ -6,10 +6,10 @@
  */
 
 #include "include/core/SkBlendMode.h"
-#include "include/gpu/GrBlend.h"
 #include "include/gpu/GrContext.h"
 #include "include/private/GrTypesPriv.h"
 #include "include/private/SkColorData.h"
+#include "src/gpu/GrBlend.h"
 #include "src/gpu/GrCaps.h"
 #include "src/gpu/GrContextPriv.h"
 #include "src/gpu/GrPaint.h"