Backporting JSONValues from protocol::Values

third_party/WebKit/Source/platform/graphics/PictureSnapshot.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 156 matching lines @@
             canvas.clipRect(SkRect::MakeXYWH(clipRect->x(), clipRect->y(), clipRect->width(), clipRect->height()));
             canvas.resetStepCount();
         }
         canvas.setTimings(currentTimings);
         m_picture->playback(&canvas);
         now = WTF::monotonicallyIncreasingTime();
     }
     return timings;
 }
 
-PassRefPtr<JSONArray> PictureSnapshot::snapshotCommandLog() const
+std::unique_ptr<JSONArray> PictureSnapshot::snapshotCommandLog() const
 {
     const SkIRect bounds = m_picture->cullRect().roundOut();
     LoggingCanvas canvas(bounds.width(), bounds.height());
     m_picture->playback(&canvas);
     return canvas.log();
 }
 
 } // namespace blink