Remove many uses of kSkia8888 and kSkiaGamma8888

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3405

Change-Id: Ie920f4bcbb3dd28114a66f2363643bb10009b840
Reviewed-on: https://skia-review.googlesource.com/3405
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/tests/SpecialSurfaceTest.cpp b/tests/SpecialSurfaceTest.cpp
index a0ec317..1867e25 100644
--- a/tests/SpecialSurfaceTest.cpp
+++ b/tests/SpecialSurfaceTest.cpp
@@ -81,7 +81,7 @@
 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialSurface_Gpu1, reporter, ctxInfo) {
     sk_sp<SkSpecialSurface> surf(SkSpecialSurface::MakeRenderTarget(ctxInfo.grContext(),
                                                                     kSmallerSize, kSmallerSize,
-                                                                    kSkia8888_GrPixelConfig,
+                                                                    kRGBA_8888_GrPixelConfig,
                                                                     nullptr));
 
     test_surface(surf, reporter, 0);