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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/src/gpu/gl/debug/GrBufferObj.h b/src/gpu/gl/debug/GrBufferObj.h
index 3c7a30b..65b1caf 100644
--- a/src/gpu/gl/debug/GrBufferObj.h
+++ b/src/gpu/gl/debug/GrBufferObj.h
@@ -19,7 +19,7 @@
 public:
     GrBufferObj()
         : GrFakeRefObj()
-        , fDataPtr(NULL)
+        , fDataPtr(nullptr)
         , fMapped(false)
         , fBound(false)
         , fSize(0)