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

third_party/WebKit/Source/core/layout/ng/geometry/ng_margin_strut.cc

Index: third_party/WebKit/Source/core/layout/ng/geometry/ng_margin_strut.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/geometry/ng_margin_strut.cc b/third_party/WebKit/Source/core/layout/ng/geometry/ng_margin_strut.cc
deleted file mode 100644
index eabab22f543b5541cc8125bc0bc438567d0e6030..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/layout/ng/geometry/ng_margin_strut.cc
+++ /dev/null
@@ -1,35 +0,0 @@
-// 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_margin_strut.h"
-
-#include "wtf/text/WTFString.h"
-
-namespace blink {
-
-LayoutUnit NGMarginStrut::Sum() const {
-  return margin + negative_margin;
-}
-
-bool NGMarginStrut::operator==(const NGMarginStrut& other) const {
-  return margin == other.margin && negative_margin == other.negative_margin;
-}
-
-void NGMarginStrut::Append(const LayoutUnit& value) {
-  if (value < 0) {
-    negative_margin = std::min(value, negative_margin);
-  } else {
-    margin = std::max(value, margin);
-  }
-}
-
-String NGMarginStrut::ToString() const {
-  return String::format("%d %d", margin.toInt(), negative_margin.toInt());
-}
-
-std::ostream& operator<<(std::ostream& stream, const NGMarginStrut& value) {
-  return stream << value.ToString();
-}
-
-}  // namespace blink