Revert of Back PaintRecord with PaintOpBuffer instead of SkPicture

cc/paint/paint_record.cc

-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "cc/paint/paint_record.h"
-
-#include "cc/paint/paint_op_buffer.h"
-#include "third_party/skia/include/core/SkPictureRecorder.h"
-
-namespace cc {
-
-sk_sp<SkPicture> ToSkPicture(sk_sp<PaintRecord> record) {
-  SkPictureRecorder recorder;
-  SkCanvas* canvas = recorder.beginRecording(record->cullRect());
-  record->playback(canvas);
-  return recorder.finishRecordingAsPicture();
-}
-
-sk_sp<const SkPicture> ToSkPicture(sk_sp<const PaintRecord> record) {
-  SkPictureRecorder recorder;
-  SkCanvas* canvas = recorder.beginRecording(record->cullRect());
-  record->playback(canvas);
-  return recorder.finishRecordingAsPicture();
-}
-
-}  // namespace cc