Stop pushing the value of 'default' to LoadableTextTrack

Source/core/html/track/LoadableTextTrack.cpp

 /*
  * Copyright (C) 2011 Google 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 21 matching lines @@
 #include "core/html/track/vtt/VTTRegionList.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 LoadableTextTrack::LoadableTextTrack(HTMLTrackElement* track)
     : TextTrack(emptyAtom, emptyAtom, emptyAtom, emptyAtom, TrackElement)
     , m_trackElement(track)
     , m_loadTimer(this, &LoadableTextTrack::loadTimerFired)
-    , m_isDefault(false)
 {
 }
 
 LoadableTextTrack::~LoadableTextTrack()
 {
 #if !ENABLE(OILPAN)
     ASSERT(!m_trackElement);
 #endif
 }
 
 #if !ENABLE(OILPAN)
 void LoadableTextTrack::clearTrackElement()
 {
     m_trackElement = nullptr;
 }
 #endif
 
+bool LoadableTextTrack::isDefault() const
+{
+    ASSERT(m_trackElement);
+    return m_trackElement->fastHasAttribute(defaultAttr);
+}
+
 void LoadableTextTrack::setMode(const AtomicString& mode)
 {
     TextTrack::setMode(mode);
 #if !ENABLE(OILPAN)
     if (!m_trackElement)
         return;
 #endif
 
     if (m_trackElement->readyState() == HTMLTrackElement::NONE)
         m_trackElement->scheduleLoad();
@@ skipping 98 matching lines @@
 }
 
 DEFINE_TRACE(LoadableTextTrack)
 {
     visitor->trace(m_trackElement);
     visitor->trace(m_loader);
     TextTrack::trace(visitor);
 }
 
 } // namespace blink