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

third_party/WebKit/Source/core/layout/ng/ng_physical_box_fragment.cc

 // 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.
 
 #include "core/layout/ng/ng_physical_box_fragment.h"
 
 namespace blink {
 
 NGPhysicalBoxFragment::NGPhysicalBoxFragment(
     NGPhysicalSize size,
     NGPhysicalSize overflow,
     HeapVector<Member<const NGPhysicalFragment>>& children,
     HeapLinkedHashSet<WeakMember<NGBlockNode>>& out_of_flow_descendants,
     Vector<NGStaticPosition>& out_of_flow_positions,
-    NGMarginStrut margin_strut,
+    NGDeprecatedMarginStrut margin_strut,
     HeapVector<Member<NGFloatingObject>>& unpositioned_floats,
     HeapVector<Member<NGFloatingObject>>& positioned_floats,
     NGBreakToken* break_token)
     : NGPhysicalFragment(size,
                          overflow,
                          kFragmentBox,
                          out_of_flow_descendants,
                          out_of_flow_positions,
                          unpositioned_floats,
                          positioned_floats,
                          break_token),
       margin_strut_(margin_strut) {
   children_.swap(children);
 }
 
 DEFINE_TRACE_AFTER_DISPATCH(NGPhysicalBoxFragment) {
   visitor->trace(children_);
   NGPhysicalFragment::traceAfterDispatch(visitor);
 }
 
 }  // namespace blink