Upgrade align-self and align-items parsing to CSS 3

Source/core/rendering/RenderMenuList.cpp

Index: Source/core/rendering/RenderMenuList.cpp
diff --git a/Source/core/rendering/RenderMenuList.cpp b/Source/core/rendering/RenderMenuList.cpp
index 4b9e7d84fd046deebf50ab97bacb90559f67a6d8..898e43f9a2d676591a68175920728227fd31614b 100644
--- a/Source/core/rendering/RenderMenuList.cpp
+++ b/Source/core/rendering/RenderMenuList.cpp
@@ -106,10 +106,10 @@ void RenderMenuList::adjustInnerStyle()
     // Use margin:auto instead of align-items:center to get safe centering, i.e.
     // when the content overflows, treat it the same as align-items: flex-start.
     // But we only do that for the cases where html.css would otherwise use center.
-    if (style()->alignItems() == AlignCenter) {
+    if (style()->alignItems() == ItemPositionCenter) {
         innerStyle->setMarginTop(Length());
         innerStyle->setMarginBottom(Length());
-        innerStyle->setAlignSelf(AlignFlexStart);
+        innerStyle->setAlignSelf(ItemPositionFlexStart);
     }
 
     innerStyle->setPaddingLeft(Length(RenderTheme::theme().popupInternalPaddingLeft(style()), Fixed));