[LayoutNG] Move remaining ng_units structs to their own files

third_party/WebKit/Source/core/layout/ng/ng_physical_box_fragment.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 NGPhysicalBoxFragment_h
 #define NGPhysicalBoxFragment_h
 
 #include "core/CoreExport.h"
+#include "core/layout/ng/geometry/ng_logical_offset.h"
+#include "core/layout/ng/geometry/ng_margin_strut.h"
 #include "core/layout/ng/ng_physical_fragment.h"
-#include "core/layout/ng/ng_units.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Optional.h"
 
 namespace blink {
 
 struct NGFloatingObject;
 
 class CORE_EXPORT NGPhysicalBoxFragment final : public NGPhysicalFragment {
  public:
   // This modifies the passed-in children vector.
@@ skipping 33 matching lines @@
 
 DEFINE_TYPE_CASTS(NGPhysicalBoxFragment,
                   NGPhysicalFragment,
                   fragment,
                   fragment->Type() == NGPhysicalFragment::kFragmentBox,
                   fragment.Type() == NGPhysicalFragment::kFragmentBox);
 
 }  // namespace blink
 
 #endif  // NGPhysicalBoxFragment_h