Style Change: NULL->nullptr
DOCS_PREVIEW= https://skia.org/?cl=1316233002

Review URL: https://codereview.chromium.org/1316233002
diff --git a/tests/PremulAlphaRoundTripTest.cpp b/tests/PremulAlphaRoundTripTest.cpp
index e230f11..211006a 100644
--- a/tests/PremulAlphaRoundTripTest.cpp
+++ b/tests/PremulAlphaRoundTripTest.cpp
@@ -87,7 +87,7 @@
                     continue;
                 }
                 GrContext* ctx = factory->get(type);
-                if (NULL == ctx) {
+                if (nullptr == ctx) {
                     continue;
                 }
                 device.reset(SkGpuDevice::Create(ctx, SkSurface::kNo_Budgeted, info, 0, &props,