Migrate WTF::HashSet::add() to ::insert() [part 1 of N]

third_party/WebKit/Source/core/xml/XPathPath.cpp

 /*
  * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006, 2009 Apple Inc.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 127 matching lines @@
       newNodes->markSubtreesDisjoint(true);
 
     for (const auto& inputNode : nodes) {
       NodeSet* matches = NodeSet::create();
       step->evaluate(context, inputNode, *matches);
 
       if (!matches->isSorted())
         resultIsSorted = false;
 
       for (const auto& node : *matches) {
-        if (!needToCheckForDuplicateNodes || newNodesSet.add(node).isNewEntry)
+        if (!needToCheckForDuplicateNodes ||
+            newNodesSet.insert(node).isNewEntry)
           newNodes->append(node);
       }
     }
 
     nodes.swap(*newNodes);
   }
 
   nodes.markSorted(resultIsSorted);
 }
 
@@ skipping 34 matching lines @@
 
   NodeSet& nodes = v.modifiableNodeSet(context);
   m_path->evaluate(context, nodes);
 
   return v;
 }
 
 }  // namespace XPath
 
 }  // namespace blink