Cleanup friends of LayoutObject

Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp

Index: Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
diff --git a/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp b/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
index fc9acaceadefedea7be2f826b9ac8b4e6f1fd85b..112267ec11f1170f8260ccd8b2b81d1f14904ade 100644
--- a/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
+++ b/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
@@ -1116,7 +1116,7 @@ void DeprecatedPaintLayerScrollableArea::updateScrollCornerStyle()
     if (corner) {
         if (!m_scrollCorner) {
             m_scrollCorner = LayoutScrollbarPart::createAnonymous(&box().document());
-            m_scrollCorner->setParent(&box());
+            m_scrollCorner->setDangerousOneWayParent(&box());
         }
         m_scrollCorner->setStyle(corner.release());
     } else if (m_scrollCorner) {
@@ -1244,7 +1244,7 @@ void DeprecatedPaintLayerScrollableArea::updateResizerStyle()
     if (resizer) {
         if (!m_resizer) {
             m_resizer = LayoutScrollbarPart::createAnonymous(&box().document());
-            m_resizer->setParent(&box());
+            m_resizer->setDangerousOneWayParent(&box());
         }
         m_resizer->setStyle(resizer.release());
     } else if (m_resizer) {