Oilpan: tidy up AutoplayExperimentHelper.

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

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 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 3517 matching lines @@
     visitor->trace(m_mediaSource);
     visitor->trace(m_audioTracks);
     visitor->trace(m_videoTracks);
     visitor->trace(m_cueTimeline);
     visitor->trace(m_textTracks);
     visitor->trace(m_textTracksWhenResourceSelectionBegan);
 #if ENABLE(WEB_AUDIO)
     visitor->trace(m_audioSourceProvider);
     visitor->template registerWeakMembers<HTMLMediaElement, &HTMLMediaElement::clearWeakMembers>(this);
 #endif
+    visitor->trace(m_autoplayHelper);
     HeapSupplementable<HTMLMediaElement>::trace(visitor);
 #endif
     HTMLElement::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 void HTMLMediaElement::createPlaceholderTracksIfNecessary()
 {
     if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
         return;
@@ skipping 123 matching lines @@
     visitor->trace(m_client);
 }
 
 DEFINE_TRACE(HTMLMediaElement::AudioSourceProviderImpl)
 {
     visitor->trace(m_client);
 }
 #endif
 
 }