Oilpan: Replace most of RefPtrs for Event objects with oilpan's transition types

Source/core/html/HTMLFormElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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
@@ skipping 417 matching lines @@
 void HTMLFormElement::requestAutocomplete()
 {
     if (!document().frame() || !shouldAutocomplete() || !UserGestureIndicator::processingUserGesture())
         finishRequestAutocomplete(AutocompleteResultErrorDisabled);
     else
         document().frame()->loader().client()->didRequestAutocomplete(this);
 }
 
 void HTMLFormElement::finishRequestAutocomplete(AutocompleteResult result)
 {
-    RefPtr<Event> event;
+    RefPtrWillBeRawPtr<Event> event = nullptr;
     if (result == AutocompleteResultSuccess)
         event = Event::create(EventTypeNames::autocomplete);
     else if (result == AutocompleteResultErrorDisabled)
         event = AutocompleteErrorEvent::create("disabled");
     else if (result == AutocompleteResultErrorCancel)
         event = AutocompleteErrorEvent::create("cancel");
     else if (result == AutocompleteResultErrorInvalid)
         event = AutocompleteErrorEvent::create("invalid");
+    else
+        ASSERT_NOT_REACHED();
 
     event->setTarget(this);
     m_pendingAutocompleteEvents.append(event.release());
 
     // Dispatch events later as this API is meant to work asynchronously in all situations and implementations.
     if (!m_requestAutocompleteTimer.isActive())
         m_requestAutocompleteTimer.startOneShot(0, FROM_HERE);
 }
 
 void HTMLFormElement::requestAutocompleteTimerFired(Timer<HTMLFormElement>*)
 {
-    Vector<RefPtr<Event> > pendingEvents;
+    WillBeHeapVector<RefPtrWillBeMember<Event> > pendingEvents;
     m_pendingAutocompleteEvents.swap(pendingEvents);
     for (size_t i = 0; i < pendingEvents.size(); ++i)
         dispatchEvent(pendingEvents[i].release());
 }
 
 void HTMLFormElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == actionAttr)
         m_attributes.parseAction(value);
     else if (name == targetAttr)
@@ skipping 306 matching lines @@
 }
 
 void HTMLFormElement::setDemoted(bool demoted)
 {
     if (demoted)
         UseCounter::count(document(), UseCounter::DemotedFormElement);
     m_wasDemoted = demoted;
 }
 
 } // namespace