Migrate WTF::HashCountedSet::add() to ::insert()

third_party/WebKit/Source/core/dom/CSSSelectorWatch.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 91 matching lines @@
     shouldUpdateTimer = true;
     auto it = m_addedSelectors.find(selector);
     if (it != m_addedSelectors.end())
       m_addedSelectors.erase(it);
     else
       m_removedSelectors.insert(selector);
   }
 
   for (const auto& selector : addedSelectors) {
     HashCountedSet<String>::AddResult result =
-        m_matchingCallbackSelectors.add(selector);
+        m_matchingCallbackSelectors.insert(selector);
     if (!result.isNewEntry)
       continue;
 
     shouldUpdateTimer = true;
     auto it = m_removedSelectors.find(selector);
     if (it != m_removedSelectors.end())
       m_removedSelectors.erase(it);
     else
       m_addedSelectors.insert(selector);
   }
@@ skipping 44 matching lines @@
   }
   supplementable()->styleEngine().watchedSelectorsChanged();
 }
 
 DEFINE_TRACE(CSSSelectorWatch) {
   visitor->trace(m_watchedCallbackSelectors);
   Supplement<Document>::trace(visitor);
 }
 
 }  // namespace blink