--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -12808,21 +12808,17 @@ Iterator::AppendItemsToList(const Iterat
       !aTargetList.mUndisplayedItems.IsEmpty()) {
     do {
       AppendItemToList(aTargetList);
     } while (*this != aEnd);
     return;
   }
 
   // Move our entire list of items into the empty target list.
-  // XXX: If LinkedList supports move assignment, we could use
-  // aTargetList.mItems = Move(mList.mItems);
-  aTargetList.mItems.~LinkedList<FrameConstructionItem>();
-  new (&aTargetList.mItems) LinkedList<FrameConstructionItem>(
-    Move(mList.mItems));
+  aTargetList.mItems = Move(mList.mItems);
 
   // Copy over the various counters
   aTargetList.mInlineCount = mList.mInlineCount;
   aTargetList.mBlockCount = mList.mBlockCount;
   aTargetList.mLineParticipantCount = mList.mLineParticipantCount;
   aTargetList.mItemCount = mList.mItemCount;
   memcpy(aTargetList.mDesiredParentCounts, mList.mDesiredParentCounts,
          sizeof(aTargetList.mDesiredParentCounts));