Revert of [LayoutNG] Move remaining ng_units structs to their own files

third_party/WebKit/Source/core/layout/ng/geometry/ng_box_strut.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 NGBoxStrut_h
-#define NGBoxStrut_h
-
-#include "core/layout/ng/ng_writing_mode.h"
-#include "platform/LayoutUnit.h"
-#include "platform/text/TextDirection.h"
-
-namespace blink {
-
-// This struct is used for storing margins, borders or padding of a box on all
-// four edges.
-struct NGBoxStrut {
-  NGBoxStrut() {}
-  NGBoxStrut(LayoutUnit inline_start,
-             LayoutUnit inline_end,
-             LayoutUnit block_start,
-             LayoutUnit block_end)
-      : inline_start(inline_start),
-        inline_end(inline_end),
-        block_start(block_start),
-        block_end(block_end) {}
-
-  LayoutUnit InlineSum() const { return inline_start + inline_end; }
-  LayoutUnit BlockSum() const { return block_start + block_end; }
-
-  bool IsEmpty() const;
-
-  // The following two operators exist primarily to have an easy way to access
-  // the sum of border and padding.
-  NGBoxStrut& operator+=(const NGBoxStrut& other) {
-    inline_start += other.inline_start;
-    inline_end += other.inline_end;
-    block_start += other.block_start;
-    block_end += other.block_end;
-    return *this;
-  }
-
-  NGBoxStrut operator+(const NGBoxStrut& other) {
-    NGBoxStrut result(*this);
-    result += other;
-    return result;
-  }
-
-  bool operator==(const NGBoxStrut& other) const;
-
-  String ToString() const;
-
-  LayoutUnit inline_start;
-  LayoutUnit inline_end;
-  LayoutUnit block_start;
-  LayoutUnit block_end;
-};
-
-std::ostream& operator<<(std::ostream&, const NGBoxStrut&);
-
-// Struct to store physical dimensions, independent of writing mode and
-// direction.
-// See https://drafts.csswg.org/css-writing-modes-3/#abstract-box
-struct NGPhysicalBoxStrut {
-  LayoutUnit left;
-  LayoutUnit right;
-  LayoutUnit top;
-  LayoutUnit bottom;
-  NGBoxStrut ConvertToLogical(NGWritingMode, TextDirection) const;
-};
-
-}  // namespace blink
-
-#endif  // NGBoxStrut_h