Style Change: NULL->nullptr

src/core/SkImageGeneratorPriv.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImageGeneratorPriv_DEFINED
 #define SkImageGeneratorPriv_DEFINED
 
 #include "SkImageGenerator.h"
 #include "SkDiscardableMemory.h"
 
 /**
  *  Takes ownership of SkImageGenerator.  If this method fails for
  *  whatever reason, it will return false and immediatetely delete
  *  the generator.  If it succeeds, it will modify destination
  *  bitmap.
  *
- *  If generator is NULL, will safely return false.
+ *  If generator is nullptr, will safely return false.
  *
  *  If this fails or when the SkDiscardablePixelRef that is
  *  installed into destination is destroyed, it will call
  *  `delete` on the generator.  Therefore, generator should be
  *  allocated with `new`.
  *
  *  @param destination Upon success, this bitmap will be
  *  configured and have a pixelref installed.
  *
- *  @param factory If not NULL, this object will be used as a
- *  source of discardable memory when decoding.  If NULL, then
+ *  @param factory If not nullptr, this object will be used as a
+ *  source of discardable memory when decoding.  If nullptr, then
  *  SkDiscardableMemory::Create() will be called.
  *
  *  @return true iff successful.
  */
 bool SkInstallDiscardablePixelRef(SkImageGenerator*, const SkIRect* subset, SkBitmap* destination,
                                   SkDiscardableMemory::Factory* factory);
 
 #endif