Style Change: NULL->nullptr

src/ports/SkFontMgr_empty_factory.cpp

 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkFontMgr.h"
 
 SkFontMgr* SkFontMgr::Factory() {
-    // Always return NULL, an empty SkFontMgr will be used.
-    return NULL;
+    // Always return nullptr, an empty SkFontMgr will be used.
+    return nullptr;
 }