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

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

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 241 matching lines @@
         type = "null";
       else if (port->isNeutered())
         type = "already neutered";
       else
         type = "a duplicate";
       exceptionState.throwDOMException(
           DataCloneError,
           "Port at index " + String::number(i) + " is " + type + ".");
       return nullptr;
     }
-    visited.add(port);
+    visited.insert(port);
   }
 
   UseCounter::count(context, UseCounter::MessagePortsTransferred);
 
   // Passed-in ports passed validity checks, so we can disentangle them.
   std::unique_ptr<MessagePortChannelArray> portArray =
       WTF::wrapUnique(new MessagePortChannelArray(ports.size()));
   for (unsigned i = 0; i < ports.size(); ++i)
     (*portArray)[i] = ports[i]->disentangle();
   return portArray;
@@ skipping 15 matching lines @@
   }
   return portArray;
 }
 
 DEFINE_TRACE(MessagePort) {
   ContextLifecycleObserver::trace(visitor);
   EventTargetWithInlineData::trace(visitor);
 }
 
 }  // namespace blink