Revert of Recompute overflow after transform changes

Source/core/rendering/style/RenderStyleConstants.h

Index: Source/core/rendering/style/RenderStyleConstants.h
diff --git a/Source/core/rendering/style/RenderStyleConstants.h b/Source/core/rendering/style/RenderStyleConstants.h
index f9f384ab49f23b7c4f823b60e542066b54985e9a..7c3a439a76934ee190ce18f8a95ad0e1ee941614 100644
--- a/Source/core/rendering/style/RenderStyleConstants.h
+++ b/Source/core/rendering/style/RenderStyleConstants.h
@@ -52,6 +52,8 @@ enum PrintColorAdjust {
 // - StyleDifferenceRepaint - The object just needs to be repainted.
 // - StyleDifferenceRepaintLayer - The layer and its descendant layers need to be repainted.
 // - StyleDifferenceLayoutPositionedMovementOnly - Only the position of this positioned object has been updated.
+// - StyleDifferenceSimplifiedLayout - Only overflow needs to be recomputed.
+// - StyleDifferenceSimplifiedLayoutAndPositionedMovement - Both positioned movement and simplified layout updates are required.
 // - StyleDifferenceLayout - A full layout is required.
 enum StyleDifference {
     StyleDifferenceEqual,
@@ -59,6 +61,8 @@ enum StyleDifference {
     StyleDifferenceRepaint,
     StyleDifferenceRepaintLayer,
     StyleDifferenceLayoutPositionedMovementOnly,
+    StyleDifferenceSimplifiedLayout,
+    StyleDifferenceSimplifiedLayoutAndPositionedMovement,
     StyleDifferenceLayout
 };