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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/gm/tinybitmap.cpp b/gm/tinybitmap.cpp
index 9bfa228..7942b42 100644
--- a/gm/tinybitmap.cpp
+++ b/gm/tinybitmap.cpp
@@ -20,7 +20,7 @@
     SkBitmap bm;
     bm.allocPixels(SkImageInfo::Make(1, 1, kIndex_8_SkColorType,
                                      kPremul_SkAlphaType),
-                   NULL, ctable);
+                   nullptr, ctable);
     ctable->unref();
 
     bm.lockPixels();