[Reland] Remove PaintInfo's paintingRoot

third_party/WebKit/Source/core/paint/PaintInfo.cpp

 // Copyright 2014 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 "core/paint/PaintInfo.h"
 
 namespace blink {
 
-void PaintInfo::updatePaintingRootForChildren(const LayoutObject* layoutObject)
-{
-    if (!paintingRoot)
-        return;
-
-    // If we're the painting root, kids draw normally, and see root of nullptr.
-    if (paintingRoot == layoutObject) {
-        paintingRoot = nullptr;
-        return;
-    }
-}
-
-bool PaintInfo::shouldPaintWithinRoot(const LayoutObject* layoutObject) const
-{
-    return !paintingRoot || paintingRoot == layoutObject;
-}
-
 void PaintInfo::updateCullRect(const AffineTransform& localToParentTransform)
 {
     m_cullRect.updateCullRect(localToParentTransform);
 }
 
 } // namespace blink