Revert of Add support of leader_point in NGLayoutOpportunityIterator.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NGLayoutOpportunityIterator_h
 #define NGLayoutOpportunityIterator_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_layout_opportunity_tree_node.h"
@@ skipping 15 matching lines @@
   // @param space Constraint space with exclusions for which this iterator needs
   //              to generate layout opportunities.
   // @param origin_point Optional origin_point parameter that is used as a
   //                     default start point for layout opportunities.
   // @param leader_point Optional 'leader' parameter that is used to specify the
   //                     ending point of temporary excluded rectangle which
   //                     starts from 'origin'. This rectangle may represent a
   //                     text fragment for example.
   NGLayoutOpportunityIterator(
       NGConstraintSpace* space,
-      const NGLogicalOffset& origin_point = NGLogicalOffset(),
-      const NGLogicalOffset& leader_point = NGLogicalOffset());
+      const NGLogicalOffset origin_point = NGLogicalOffset(),
+      const NGLogicalOffset leader_point = NGLogicalOffset());
 
   // Gets the next Layout Opportunity or nullptr if the search is exhausted.
   // TODO(chrome-layout-team): Refactor with using C++ <iterator> library.
   const NGLayoutOpportunity Next();
 
   DEFINE_INLINE_VIRTUAL_TRACE() {
     visitor->trace(constraint_space_);
     visitor->trace(opportunity_tree_root_);
   }
 
  private:
   // Mutable Getters.
   NGLayoutOpportunityTreeNode* MutableOpportunityTreeRoot() {
     return opportunity_tree_root_.get();
   }
 
   // Read-only Getters.
   const NGLayoutOpportunityTreeNode* OpportunityTreeRoot() const {
     return opportunity_tree_root_.get();
   }
 
   Member<NGConstraintSpace> constraint_space_;
+  const NGLogicalOffset leader_point_;
 
   NGLayoutOpportunities opportunities_;
   NGLayoutOpportunities::const_iterator opportunity_iter_;
   Member<NGLayoutOpportunityTreeNode> opportunity_tree_root_;
 };
 
 }  // namespace blink
 
 #endif  // NGLayoutOpportunityIterator_h