[LayoutNG] Remove derived constraint spaces from opportunity iterator.

third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_tree_node.h

Index: third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_tree_node.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_tree_node.h b/third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_tree_node.h
index e3947244818cd5d27deb316034b61d55fa5e3552..fc8587e4bd7c1bb746c6a80a0817254bb59503ad 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_tree_node.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_tree_node.h
@@ -18,20 +18,19 @@ struct NGLayoutOpportunityTreeNode
   // Default constructor.
   // Creates a Layout Opportunity tree node that is limited by it's own edge
   // from above.
-  // @param space Constraint space associated with this node.
-  NGLayoutOpportunityTreeNode(const NGConstraintSpace* space) : space(space) {
-    exclusion_edge.start = space->Offset().inline_offset;
-    exclusion_edge.end = exclusion_edge.start + space->Size().inline_size;
+  // @param opportunity The layout opportunity for this node.
+  NGLayoutOpportunityTreeNode(const NGLogicalRect opportunity)
+      : opportunity(opportunity) {
+    exclusion_edge.start = opportunity.offset.inline_offset;
+    exclusion_edge.end = exclusion_edge.start + opportunity.size.inline_size;
   }
 
   // Constructor that creates a node with explicitly set exclusion edge.
   // @param space Constraint space associated with this node.
   // @param exclusion_edge Edge that limits this node's space from above.
-  NGLayoutOpportunityTreeNode(NGConstraintSpace* space, NGEdge exclusion_edge)
-      : space(space), exclusion_edge(exclusion_edge) {}
-
-  // Constraint space that is associated with this node.
-  Member<const NGConstraintSpace> space;
+  NGLayoutOpportunityTreeNode(const NGLogicalRect opportunity,
+                              NGEdge exclusion_edge)
+      : opportunity(opportunity), exclusion_edge(exclusion_edge) {}
 
   // Children of the node.
   Member<NGLayoutOpportunityTreeNode> left;
@@ -41,15 +40,17 @@ struct NGLayoutOpportunityTreeNode
   // Exclusion that split apart this layout opportunity.
   Member<const NGExclusion> exclusion;
 
+  // The top layout opportunity associated with this node.
+  NGLogicalRect opportunity;
+
   // Edge that limits this layout opportunity from above.
   NGEdge exclusion_edge;
 
   // Whether this node is a leaf node.
-  // The node is a leaf if it doen't have an exclusion that splits it apart.
+  // The node is a leaf if it doesn't have an exclusion that splits it apart.
   bool IsLeafNode() const { return !exclusion; }
 
   DEFINE_INLINE_TRACE() {
-    visitor->trace(space);
     visitor->trace(left);
     visitor->trace(bottom);
     visitor->trace(right);