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

third_party/WebKit/Source/core/layout/ng/geometry/ng_box_strut.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/geometry/ng_box_strut.h"
-
-#include "wtf/text/WTFString.h"
-
-namespace blink {
-
-bool NGBoxStrut::IsEmpty() const {
-  return *this == NGBoxStrut();
-}
-
-bool NGBoxStrut::operator==(const NGBoxStrut& other) const {
-  return std::tie(other.inline_start, other.inline_end, other.block_start,
-                  other.block_end) ==
-         std::tie(inline_start, inline_end, block_start, block_end);
-}
-
-// Converts physical dimensions to logical ones per
-// https://drafts.csswg.org/css-writing-modes-3/#logical-to-physical
-NGBoxStrut NGPhysicalBoxStrut::ConvertToLogical(NGWritingMode writing_mode,
-                                                TextDirection direction) const {
-  NGBoxStrut strut;
-  switch (writing_mode) {
-    case kHorizontalTopBottom:
-      strut = {left, right, top, bottom};
-      break;
-    case kVerticalRightLeft:
-    case kSidewaysRightLeft:
-      strut = {top, bottom, right, left};
-      break;
-    case kVerticalLeftRight:
-      strut = {top, bottom, left, right};
-      break;
-    case kSidewaysLeftRight:
-      strut = {bottom, top, left, right};
-      break;
-  }
-  if (direction == TextDirection::kRtl)
-    std::swap(strut.inline_start, strut.inline_end);
-  return strut;
-}
-
-String NGBoxStrut::ToString() const {
-  return String::format("Inline: (%d %d) Block: (%d %d)", inline_start.toInt(),
-                        inline_end.toInt(), block_start.toInt(),
-                        block_end.toInt());
-}
-
-std::ostream& operator<<(std::ostream& stream, const NGBoxStrut& value) {
-  return stream << value.ToString();
-}
-
-}  // namespace blink