Make NGFragment to own NGPhysicalFragment

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 f7ef2e236c9daf7dfb89efc16267fb26051ef9a9..e35588f80a7a808daed298f62772a134769b831c 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
@@ -72,11 +72,11 @@ NGPhysicalFragment* NGFragmentBuilder::ToFragment() {
   DCHECK_EQ(offsets_.size(), children_.size());
 
   NGPhysicalSize physical_size = size_.ConvertToPhysical(writing_mode_);
-  HeapVector<Member<const NGPhysicalFragmentBase>> children;
+  Vector<const NGPhysicalFragmentBase*> children;
   children.reserveCapacity(children_.size());
 
   for (size_t i = 0; i < children_.size(); ++i) {
-    NGPhysicalFragmentBase* child = children_[i].get();
+    NGPhysicalFragmentBase* child = children_[i];
     child->SetOffset(offsets_[i].ConvertToPhysical(
         writing_mode_, direction_, physical_size, child->Size()));
     children.append(child);