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

third_party/WebKit/Source/core/layout/ng/ng_exclusion.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 NGExclusion_h
-#define NGExclusion_h
-
-#include "core/CoreExport.h"
-#include "core/layout/ng/geometry/ng_logical_rect.h"
-#include "wtf/Vector.h"
-
-namespace blink {
-
-// Struct that represents NG exclusion.
-struct CORE_EXPORT NGExclusion {
-  // Type of NG exclusion.
-  enum Type {
-    // Undefined exclusion type.
-    // At this moment it's also used to represent CSS3 exclusion.
-    kExclusionTypeUndefined = 0,
-    // Exclusion that is created by LEFT float.
-    kFloatLeft = 1,
-    // Exclusion that is created by RIGHT float.
-    kFloatRight = 2
-  };
-
-  // Rectangle in logical coordinates the represents this exclusion.
-  NGLogicalRect rect;
-
-  // Type of this exclusion.
-  Type type;
-
-  bool operator==(const NGExclusion& other) const;
-  String ToString() const;
-};
-
-CORE_EXPORT std::ostream& operator<<(std::ostream&, const NGExclusion&);
-
-struct CORE_EXPORT NGExclusions {
-  NGExclusions();
-  NGExclusions(const NGExclusions& other);
-
-  Vector<std::unique_ptr<const NGExclusion>> storage;
-
-  // Last left/right float exclusions are used to enforce the top edge alignment
-  // rule for floats and for the support of CSS "clear" property.
-  const NGExclusion* last_left_float;   // Owned by storage.
-  const NGExclusion* last_right_float;  // Owned by storage.
-
-  NGExclusions& operator=(const NGExclusions& other);
-
-  void Add(const NGExclusion& exclusion);
-};
-
-}  // namespace blink
-
-#endif  // NGExclusion_h