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

third_party/WebKit/Source/core/html/HTMLDocument.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights
  * reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 192 matching lines @@
       &hreflangAttr,       &http_equivAttr, &langAttr,     &languageAttr,
       &linkAttr,           &mediaAttr,      &methodAttr,   &multipleAttr,
       &nohrefAttr,         &noresizeAttr,   &noshadeAttr,  &nowrapAttr,
       &readonlyAttr,       &relAttr,        &revAttr,      &rulesAttr,
       &scopeAttr,          &scrollingAttr,  &selectedAttr, &shapeAttr,
       &targetAttr,         &textAttr,       &typeAttr,     &valignAttr,
       &valuetypeAttr,      &vlinkAttr};
 
   attrSet->reserveCapacityForSize(WTF_ARRAY_LENGTH(caseInsensitiveAttributes));
   for (const QualifiedName* attr : caseInsensitiveAttributes)
-    attrSet->add(attr->localName().impl());
+    attrSet->insert(attr->localName().impl());
 
   return attrSet;
 }
 
 bool HTMLDocument::isCaseSensitiveAttribute(
     const QualifiedName& attributeName) {
   static HashSet<StringImpl*>* htmlCaseInsensitiveAttributesSet =
       createHtmlCaseInsensitiveAttributesSet();
   bool isPossibleHTMLAttr =
       !attributeName.hasPrefix() && (attributeName.namespaceURI() == nullAtom);
   return !isPossibleHTMLAttr ||
          !htmlCaseInsensitiveAttributesSet->contains(
              attributeName.localName().impl());
 }
 
 }  // namespace blink