[MediaControls] Listen to durationchange instead of letting HTML call methods of MediaControls

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
@@ skipping 3043 matching lines @@
 
   // Abort if duration unchanged.
   if (m_duration == duration)
     return;
 
   BLINK_MEDIA_LOG << "durationChanged(" << (void*)this << ") : " << m_duration
                   << " -> " << duration;
   m_duration = duration;
   scheduleEvent(EventTypeNames::durationchange);
 
-  if (mediaControls())
-    mediaControls()->reset();
   if (layoutObject())
     layoutObject()->updateFromElement();
 
   if (requestSeek)
     seek(duration);
 }
 
 void HTMLMediaElement::playbackStateChanged() {
   BLINK_MEDIA_LOG << "playbackStateChanged(" << (void*)this << ")";
 
@@ skipping 1020 matching lines @@
       kMostlyFillViewportBecomeStableSeconds, BLINK_FROM_HERE);
 }
 
 void HTMLMediaElement::viewportFillDebouncerTimerFired(TimerBase*) {
   m_mostlyFillingViewport = true;
   if (m_webMediaPlayer)
     m_webMediaPlayer->becameDominantVisibleContent(m_mostlyFillingViewport);
 }
 
 }  // namespace blink