Rename enums in GrContextFactory to remove "GL"

tests/GrPorterDuffTest.cpp

Index: tests/GrPorterDuffTest.cpp
diff --git a/tests/GrPorterDuffTest.cpp b/tests/GrPorterDuffTest.cpp
index 566ec12f5d409947d924f567fd834ca6f056e09b..b0377715b4d13848777315ef1e238d47e5a24784 100644
--- a/tests/GrPorterDuffTest.cpp
+++ b/tests/GrPorterDuffTest.cpp
@@ -1148,7 +1148,7 @@ DEF_GPUTEST(PorterDuffNoDualSourceBlending, reporter, /*factory*/) {
     GrContextOptions opts;
     opts.fSuppressDualSourceBlending = true;
     sk_gpu_test::GrContextFactory mockFactory(opts);
-    GrContext* ctx = mockFactory.get(sk_gpu_test::GrContextFactory::kNull_GLContextType);
+    GrContext* ctx = mockFactory.get(sk_gpu_test::GrContextFactory::kNullGL_ContextType);
     if (!ctx) {
         SkFAIL("Failed to create null context without ARB_blend_func_extended.");
         return;