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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/bench/GrResourceCacheBench.cpp b/bench/GrResourceCacheBench.cpp
index e7a9ca8..ec2f8ca 100644
--- a/bench/GrResourceCacheBench.cpp
+++ b/bench/GrResourceCacheBench.cpp
@@ -71,7 +71,7 @@
 
     void onDraw(const int loops, SkCanvas* canvas) override {
         SkAutoTUnref<GrContext> context(GrContext::CreateMockContext());
-        if (NULL == context) {
+        if (nullptr == context) {
             return;
         }
         // Set the cache budget to be very large so no purging occurs.