Remove SkDrawPictureCallback

include/core/SkDrawPictureCallback.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 SkDrawPictureCallback_DEFINED
-#define SkDrawPictureCallback_DEFINED
-
-#include "SkTypes.h"
-
-#ifdef SK_LEGACY_DRAWPICTURECALLBACK
-#include "SkPicture.h"
-
-/**
- *  Subclasses of this can be passed to canvas.drawPicture(). During the drawing
- *  of the picture, this callback will periodically be invoked. If its
- *  abortDrawing() returns true, then picture playback will be interrupted.
- *
- *  The resulting drawing is undefined, as there is no guarantee how often the
- *  callback will be invoked. If the abort happens inside some level of nested
- *  calls to save(), restore will automatically be called to return the state
- *  to the same level it was before the drawPicture call was made.
- */
-class SK_API SkDrawPictureCallback : public SkPicture::AbortCallback {
-public:
-    virtual bool abortDrawing() = 0;
-
-    bool abort() override { return this->abortDrawing(); }
-};
-#endif
-
-#endif // SkDrawPictureCallback_DEFINED