Deprecate the currently used NGMarginStrut in favor of the new one.

third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.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 NGBlockLayoutAlgorithm_h
 #define NGBlockLayoutAlgorithm_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_block_node.h"
 #include "core/layout/ng/ng_layout_algorithm.h"
@@ skipping 111 matching lines @@
   // @param child_margins Margins information for the current child fragment.
   // @return Position of the fragment in the parent's constraint space.
   NGLogicalOffset PositionFloatFragment(const NGFragment& fragment,
                                         const NGBoxStrut& child_margins);
 
   // Updates block-{start|end} of the currently constructed fragment.
   //
   // This method is supposed to be called on every child but it only updates
   // the block-start once (on the first non-zero height child fragment) and
   // keeps updating block-end (on every non-zero height child).
-  void UpdateMarginStrut(const NGMarginStrut& from);
+  void UpdateMarginStrut(const NGDeprecatedMarginStrut& from);
 
   NGLogicalOffset GetChildSpaceOffset() const {
     return NGLogicalOffset(border_and_padding_.inline_start, content_size_);
   }
 
   // Read-only Getters.
   const ComputedStyle& CurrentChildStyle() const {
     DCHECK(current_child_);
     return *current_child_->Style();
   }
@@ skipping 23 matching lines @@
 
   // Mapper from the fragmented flow coordinate space coordinates to visual
   // coordinates. Only set on fragmentation context roots, such as multicol
   // containers. Keeps track of the current fragmentainer.
   Member<NGColumnMapper> fragmentainer_mapper_;
 
   NGBoxStrut border_and_padding_;
   LayoutUnit content_size_;
   LayoutUnit max_inline_size_;
   // MarginStrut for the previous child.
-  NGMarginStrut prev_child_margin_strut_;
+  NGDeprecatedMarginStrut prev_child_margin_strut_;
   // Whether the block-start was set for the currently built
   // fragment's margin strut.
   bool is_fragment_margin_strut_block_start_updated_ : 1;
   NGBoxStrut curr_child_margins_;
 };
 
 }  // namespace blink
 
 #endif  // NGBlockLayoutAlgorithm_h