Style Change: NULL->nullptr

src/opts/SkBlitMask_opts_none.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlitMask.h"
 
 SkBlitMask::BlitLCD16RowProc SkBlitMask::PlatformBlitRowProcs16(bool isOpaque) {
-    return NULL;
+    return nullptr;
 }
 
 SkBlitMask::RowProc SkBlitMask::PlatformRowProcs(SkColorType dstCT,
                                                  SkMask::Format maskFormat,
                                                  RowFlags flags) {
-    return NULL;
+    return nullptr;
 }