[LayoutNG] Fix orthogonal writing mode child margin strut from being used in collapsing margins cal…

third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h

Index: third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h b/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
index 6454993fd742a33e55cd718abf06a4e0ced54212..131dbb918730e85ec9d65421cd3e883720c14304 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
@@ -87,7 +87,7 @@ class CORE_EXPORT NGConstraintSpace final
 
   // Whether the current constraint space is for the newly established
   // Formatting Context.
-  bool IsNewFormattingContext() const { return is_new_fc_; }
+  bool IsNewFormattingContext() const;
 
   // Whether exceeding the containerSize triggers the presence of a scrollbar
   // for the indicated direction.
@@ -123,9 +123,7 @@ class CORE_EXPORT NGConstraintSpace final
   void SetOverflowTriggersScrollbar(bool inlineTriggers, bool blockTriggers);
   void SetFixedSize(bool inlineFixed, bool blockFixed);
   void SetFragmentationType(NGFragmentationType);
-  // TODO(layout-ng): Add m_isNewFc flag to ComputedStyle and use it instead of
-  // the function below.
-  void SetIsNewFormattingContext(bool is_new_fc) { is_new_fc_ = is_new_fc; }
+  void SetIsNewFormattingContext(bool is_new_fc);
 
   String ToString() const;
 
@@ -135,9 +133,6 @@ class CORE_EXPORT NGConstraintSpace final
   NGLogicalSize size_;
   unsigned writing_mode_ : 3;
   unsigned direction_ : 1;
-  // Whether the current constraint space is for the newly established
-  // formatting Context
-  bool is_new_fc_ : 1;
 };
 
 inline std::ostream& operator<<(std::ostream& stream,