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

third_party/WebKit/Source/core/xml/XPathFunctions.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 346 matching lines @@
 
     size_t endPos = startPos;
     while (endPos < length && !isWhitespace(idList[endPos]))
       ++endPos;
 
     // If there are several nodes with the same id, id() should return the first
     // one.  In WebKit, getElementById behaves so, too, although its behavior in
     // this case is formally undefined.
     Node* node = contextScope.getElementById(
         AtomicString(idList.substring(startPos, endPos - startPos)));
-    if (node && resultSet.add(node).isNewEntry)
+    if (node && resultSet.insert(node).isNewEntry)
       result->append(node);
 
     startPos = endPos;
   }
 
   result->markSorted(false);
 
   return Value(result, Value::adopt);
 }
 
@@ skipping 385 matching lines @@
     return nullptr;
 
   Function* function = functionRec->factoryFn();
   function->setArguments(args);
   function->setName(name);
   return function;
 }
 
 }  // namespace XPath
 }  // namespace blink