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

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

 /*
  * Copyright 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006 Apple Computer, 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 222 matching lines @@
 
 Value Union::evaluate(EvaluationContext& context) const {
   Value lhsResult = subExpr(0)->evaluate(context);
   Value rhs = subExpr(1)->evaluate(context);
 
   NodeSet& resultSet = lhsResult.modifiableNodeSet(context);
   const NodeSet& rhsNodes = rhs.toNodeSet(&context);
 
   HeapHashSet<Member<Node>> nodes;
   for (const auto& node : resultSet)
-    nodes.add(node);
+    nodes.insert(node);
 
   for (const auto& node : rhsNodes) {
-    if (nodes.add(node).isNewEntry)
+    if (nodes.insert(node).isNewEntry)
       resultSet.append(node);
   }
 
   // It is also possible to use merge sort to avoid making the result
   // unsorted; but this would waste the time in cases when order is not
   // important.
   resultSet.markSorted(false);
   return lhsResult;
 }
 
@@ skipping 14 matching lines @@
                     new Number(result.toNumber()))
         .evaluate(context)
         .toBoolean();
 
   return result.toBoolean();
 }
 
 }  // namespace XPath
 
 }  // namespace blink