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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/bench/GrMemoryPoolBench.cpp b/bench/GrMemoryPoolBench.cpp
index 3945774..fd29775 100644
--- a/bench/GrMemoryPoolBench.cpp
+++ b/bench/GrMemoryPoolBench.cpp
@@ -114,7 +114,7 @@
 
         for (int i = 0; i < loops; i++) {
             uint32_t idx = r.nextRangeU(0, kMaxObjects-1);
-            if (NULL == objects[idx].get()) {
+            if (nullptr == objects[idx].get()) {
                 objects[idx].reset(new B);
             } else {
                 objects[idx].free();