Make sp variants for SkData

src/core/SkStreamPriv.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkStreamPriv_DEFINED
 #define SkStreamPriv_DEFINED
 
+#include "SkRefCnt.h"
+
 class SkData;
 class SkStream;
 class SkWStream;
 
 /**
  *  Copy the provided stream to an SkData variable.
  *
  *  Note: Assumes the stream is at the beginning. If it has a length,
  *  but is not at the beginning, this call will fail (return NULL).
  *
  *  @param stream SkStream to be copied into data.
  *  @return SkData* The resulting SkData after the copy. This data
  *      will have a ref count of one upon return and belongs to the
  *      caller. Returns nullptr on failure.
  */
-SkData* SkCopyStreamToData(SkStream* stream);
+sk_sp<SkData> SkCopyStreamToData(SkStream* stream);
 
 /**
  *  Copies the input stream from the current position to the end.
  *  Does not rewind the input stream.
  */
 bool SkStreamCopy(SkWStream* out, SkStream* input);
 
 #endif  // SkStreamPriv_DEFINED