[LayoutNG] Remove derived constraint spaces from opportunity iterator.

third_party/WebKit/Source/core/layout/ng/ng_constraint_space.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 NGConstraintSpace_h
 #define NGConstraintSpace_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_physical_constraint_space.h"
 #include "core/layout/ng/ng_writing_mode.h"
@@ skipping 23 matching lines @@
   // NGPhysicalConstraintSpace. Sets this constraint space's size to the
   // physical constraint space's container size, converted to logical
   // coordinates.
   // TODO(layout-ng): Do we need this constructor?
   NGConstraintSpace(NGWritingMode, NGDirection, NGPhysicalConstraintSpace*);
 
   // Constructs a constraint space with a different NGWritingMode and
   // NGDirection that's otherwise identical.
   NGConstraintSpace(NGWritingMode, NGDirection, const NGConstraintSpace*);
 
-  // Constructs a derived constraint space sharing the same backing
-  // NGPhysicalConstraintSpace, NGWritingMode and NGDirection. Primarily for use
-  // by NGLayoutOpportunityIterator.
-  NGConstraintSpace(const NGConstraintSpace& other,
-                    NGLogicalOffset,
-                    NGLogicalSize);
-
   // Constructs a derived constraint space that shares the exclusions of the
   // input constraint space, but has a different container size, writing mode
   // and direction. Sets the offset to zero. For use by layout algorithms
   // to use as the basis to find layout opportunities for children.
   NGConstraintSpace(NGWritingMode,
                     NGDirection,
                     const NGConstraintSpace& other,
                     NGLogicalSize);
 
   // This should live on NGBox or another layout bridge and probably take a root
@@ skipping 75 matching lines @@
 };
 
 inline std::ostream& operator<<(std::ostream& stream,
                                 const NGConstraintSpace& value) {
   return stream << value.ToString();
 }
 
 }  // namespace blink
 
 #endif  // NGConstraintSpace_h