[Alignment] Single class for holding the alignment data.

Source/core/layout/LayoutBox.cpp

Index: Source/core/layout/LayoutBox.cpp
diff --git a/Source/core/layout/LayoutBox.cpp b/Source/core/layout/LayoutBox.cpp
index e2391d2b6c0ae45d488efe35a469e0532fa3d7c2..3e77013a1c7f5084e26fec352ff37c6c4b811b68 100644
--- a/Source/core/layout/LayoutBox.cpp
+++ b/Source/core/layout/LayoutBox.cpp
@@ -2135,7 +2135,7 @@ static bool columnFlexItemHasStretchAlignment(const LayoutObject* flexitem)
     ASSERT(parent->style()->isColumnFlexDirection());
     if (flexitem->style()->marginStart().isAuto() || flexitem->style()->marginEnd().isAuto())
         return false;
-    return flexitem->style()->alignSelf() == ItemPositionStretch || (flexitem->style()->alignSelf() == ItemPositionAuto && parent->style()->alignItems() == ItemPositionStretch);
+    return flexitem->style()->alignSelfPosition() == ItemPositionStretch || (flexitem->style()->alignSelfPosition() == ItemPositionAuto && parent->style()->alignItemsPosition() == ItemPositionStretch);
 }
 
 static bool isStretchingColumnFlexItem(const LayoutObject* flexitem)