[layoutng] Move and rename NGBoxMargins to NGBoxStrut

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

Index: third_party/WebKit/Source/core/layout/ng/ng_margin_strut.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_margin_strut.h b/third_party/WebKit/Source/core/layout/ng/ng_margin_strut.h
index 0d927309f6ead6b846efbc340bdee60b0dcdcb21..f8d76bf98fa7ca6f0420a9315b7b9d44a8b04f60 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_margin_strut.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_margin_strut.h
@@ -10,17 +10,6 @@
 
 namespace blink {
 
-// Stores the four margins of a box
-struct NGBoxMargins {
-  LayoutUnit inline_start;
-  LayoutUnit inline_end;
-  LayoutUnit block_start;
-  LayoutUnit block_end;
-
-  LayoutUnit InlineSum() const { return inline_start + inline_end; }
-  LayoutUnit BlockSum() const { return block_start + block_end; }
-};
-
 // This struct is used for the margin collapsing calculation.
 struct NGMarginStrut {
   LayoutUnit margin_block_start;