Revert "Remove MediaStreamDescriptor and call/use WebMediaStream directly"

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 862 matching lines @@
 
     // The resource fetch algorithm
     m_networkState = NETWORK_LOADING;
 
     // Set m_currentSrc *before* changing to the cache url, the fact that we are loading from the app
     // cache is an internal detail not exposed through the media element API.
     m_currentSrc = url;
 
     LOG(Media, "HTMLMediaElement::loadResource - m_currentSrc -> %s", urlForLoggingMedia(m_currentSrc).utf8().data());
 
-    if (!(MediaStreamRegistry::registry().lookupWebMediaStream(url.string()).isNull()))
+    if (MediaStreamRegistry::registry().lookupMediaStreamDescriptor(url.string()))
       removeBehaviorRestriction(RequireUserGestureForRateChangeRestriction);
 
     if (m_sendProgressEvents)
         startProgressEventTimer();
 
     // Reset display mode to force a recalculation of what to show because we are resetting the player.
     setDisplayMode(Unknown);
 
     if (!autoplay())
         m_player->setPreload(m_preload);
@@ skipping 3076 matching lines @@
     info.addMember(m_mediaGroup, "mediaGroup");
     info.addMember(m_mediaController, "mediaController");
 
 #if ENABLE(WEB_AUDIO)
     info.addMember(m_audioSourceNode, "audioSourceNode");
 #endif
 
 }
 
 }