Clean up HTMLTrackElement.kind invalid/missing value default handling

third_party/WebKit/Source/core/html/track/TrackBase.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 #include "core/html/HTMLMediaElement.h"
 
 namespace blink {
 
 static WebMediaPlayer::TrackId nextTrackId()
 {
     static WebMediaPlayer::TrackId next = 0;
     return ++next;
 }
 
-TrackBase::TrackBase(WebMediaPlayer::TrackType type, const AtomicString& label, const AtomicString& language, const String& id)
+TrackBase::TrackBase(WebMediaPlayer::TrackType type, const AtomicString& kind, const AtomicString& label, const AtomicString& language, const String& id)
     : m_trackId(nextTrackId())
     , m_type(type)
+    , m_kind(kind)
     , m_label(label)
     , m_language(language)
     , m_id(id)
     , m_mediaElement(nullptr)
 {
 }
 
 TrackBase::~TrackBase()
 {
 }
 
 Node* TrackBase::owner() const
 {
     return m_mediaElement;
 }
 
 DEFINE_TRACE(TrackBase)
 {
     Supplementable<TrackBase>::trace(visitor);
     visitor->trace(m_mediaElement);
 }
 
 void TrackBase::setKind(const AtomicString& kind)
 {
-    if (isValidKind(kind))
-        m_kind = kind;
-    else
-        m_kind = invalidValueDefaultKind();
+    m_kind = kind;
 }
 
 } // namespace blink