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

third_party/WebKit/Source/core/dom/DocumentStyleSheetCollector.h

 /*
  * Copyright (C) 2014 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 41 matching lines @@
                               HeapVector<Member<StyleSheet>>*,
                               HeapHashSet<Member<Document>>*);
   ~DocumentStyleSheetCollector();
 
   void appendActiveStyleSheet(const ActiveStyleSheet&);
   void appendSheetForList(StyleSheet*);
 
   bool hasVisited(Document* document) const {
     return m_visitedDocuments->contains(document);
   }
-  void willVisit(Document* document) { m_visitedDocuments->add(document); }
+  void willVisit(Document* document) { m_visitedDocuments->insert(document); }
 
  private:
   Member<StyleSheetCollection> m_collection;
   HeapVector<Member<StyleSheet>>* m_styleSheetsForStyleSheetList;
   HeapHashSet<Member<Document>>* m_visitedDocuments;
 };
 
 class ActiveDocumentStyleSheetCollector final
     : public DocumentStyleSheetCollector {
  public:
   ActiveDocumentStyleSheetCollector(StyleSheetCollection&);
 
  private:
   HeapHashSet<Member<Document>> m_visitedDocuments;
 };
 
 class ImportedDocumentStyleSheetCollector final
     : public DocumentStyleSheetCollector {
  public:
   ImportedDocumentStyleSheetCollector(DocumentStyleSheetCollector&,
                                       HeapVector<Member<StyleSheet>>&);
 };
 
 }  // namespace blink
 
 #endif  // DocumentStyleSheetCollector_h