Style Change: NULL->nullptr

gm/gm_expectations.h

Index: gm/gm_expectations.h
diff --git a/gm/gm_expectations.h b/gm/gm_expectations.h
index 029a533c620bc8e9d3bced225e9aea305de0d6e3..6767b90f51d214d23890c9addb0d58d27cdf9f5b 100644
--- a/gm/gm_expectations.h
+++ b/gm/gm_expectations.h
@@ -147,10 +147,10 @@ namespace skiagm {
          * If this Expectation is based on a single SkBitmap, return a
          * pointer to that SkBitmap. Otherwise (if the Expectation is
          * empty, or if it was based on a list of checksums rather
-         * than a single bitmap), returns NULL.
+         * than a single bitmap), returns nullptr.
          */
         const SkBitmap *asBitmap() const {
-            return (kUnknown_SkColorType == fBitmap.colorType()) ? NULL : &fBitmap;
+            return (kUnknown_SkColorType == fBitmap.colorType()) ? nullptr : &fBitmap;
         }
 
         /**