Make NGFragment to own NGPhysicalFragment

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

Index: third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc b/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
index f265f8008c875302bf8e8d53dbd393e3ee247552..b08e81cc7ba3e6e44fd35dd784513b7bc8e1ebf9 100644
--- a/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
+++ b/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
@@ -23,8 +23,7 @@ void LayoutNGBlockFlow::layoutBlock(bool relayoutChildren) {
   const auto* constraint_space =
       NGConstraintSpace::CreateFromLayoutObject(*this);
   NGBox* box = new NGBox(this);
-  NGFragment* fragment;
-  while (!box->Layout(constraint_space, &fragment))
+  while (!box->Layout(constraint_space))
     ;
   clearNeedsLayout();
 }