[LayoutNG] Move remaining ng_units structs to their own files

third_party/WebKit/Source/core/layout/ng/ng_constraint_space.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 NGConstraintSpace_h
 #define NGConstraintSpace_h
 
 #include "core/CoreExport.h"
-#include "core/layout/ng/ng_units.h"
+#include "core/layout/ng/geometry/ng_logical_offset.h"
+#include "core/layout/ng/geometry/ng_logical_size.h"
+#include "core/layout/ng/geometry/ng_margin_strut.h"
+#include "core/layout/ng/geometry/ng_physical_size.h"
+#include "core/layout/ng/ng_exclusion.h"
 #include "core/layout/ng/ng_writing_mode.h"
 #include "platform/heap/Handle.h"
+#include "platform/text/TextDirection.h"
 #include "wtf/Optional.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class LayoutBox;
 class NGBoxFragment;
 
 enum NGFragmentationType {
   kFragmentNone,
@@ skipping 161 matching lines @@
 };
 
 inline std::ostream& operator<<(std::ostream& stream,
                                 const NGConstraintSpace& value) {
   return stream << value.ToString();
 }
 
 }  // namespace blink
 
 #endif  // NGConstraintSpace_h