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

third_party/WebKit/Source/modules/websockets/DOMWebSocket.cpp

 /*
  * Copyright (C) 2011 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 346 matching lines @@
           SyntaxError, "The subprotocol '" +
                            encodeSubprotocolString(protocols[i]) +
                            "' is invalid.");
       return;
     }
   }
 
   // Fail if there're duplicated elements in |protocols|.
   HashSet<String> visited;
   for (size_t i = 0; i < protocols.size(); ++i) {
-    if (!visited.add(protocols[i]).isNewEntry) {
+    if (!visited.insert(protocols[i]).isNewEntry) {
       m_state = kClosed;
       exceptionState.throwDOMException(
           SyntaxError, "The subprotocol '" +
                            encodeSubprotocolString(protocols[i]) +
                            "' is duplicated.");
       return;
     }
   }
 
   if (getExecutionContext()->getSecurityOrigin()->hasSuborigin()) {
@@ skipping 486 matching lines @@
 
 DEFINE_TRACE(DOMWebSocket) {
   visitor->trace(m_channel);
   visitor->trace(m_eventQueue);
   WebSocketChannelClient::trace(visitor);
   EventTargetWithInlineData::trace(visitor);
   SuspendableObject::trace(visitor);
 }
 
 }  // namespace blink