Deprecate the currently used NGMarginStrut in favor of the new one.

third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.cc

Index: third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.cc b/third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.cc
index fd470a8c2f7aee58b1baa5c16893ed3d38cd62c1..8491651d3cbbefdfd33748c37ac0bff7b38f4ade 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.cc
@@ -134,14 +134,14 @@ NGFragmentBuilder& NGFragmentBuilder::AddOutOfFlowDescendant(
 }
 
 NGFragmentBuilder& NGFragmentBuilder::SetMarginStrutBlockStart(
-    const NGMarginStrut& from) {
+    const NGDeprecatedMarginStrut& from) {
   margin_strut_.margin_block_start = from.margin_block_start;
   margin_strut_.negative_margin_block_start = from.negative_margin_block_start;
   return *this;
 }
 
 NGFragmentBuilder& NGFragmentBuilder::SetMarginStrutBlockEnd(
-    const NGMarginStrut& from) {
+    const NGDeprecatedMarginStrut& from) {
   margin_strut_.margin_block_end = from.margin_block_end;
   margin_strut_.negative_margin_block_end = from.negative_margin_block_end;
   return *this;