Drop LABEL element from form-associated elements.

third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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.
@@ skipping 481 matching lines @@
     if (trackLabel.isEmpty())
         trackLabel = String(mediaElement().locale().queryString(WebLocalizedString::TextTracksNoLabel));
 
     return trackLabel;
 }
 
 // TextTrack parameter when passed in as a nullptr, creates the "Off" list item in the track list.
 Element* MediaControlTextTrackListElement::createTextTrackListItem(TextTrack* track)
 {
     int trackIndex = track ? track->trackIndex() : trackIndexOffValue;
-    HTMLLabelElement* trackItem = HTMLLabelElement::create(document(), nullptr);
+    HTMLLabelElement* trackItem = HTMLLabelElement::create(document());
     trackItem->setShadowPseudoId(AtomicString("-internal-media-controls-text-track-list-item"));
     HTMLInputElement* trackItemInput = HTMLInputElement::create(document(), nullptr, false);
     trackItemInput->setShadowPseudoId(AtomicString("-internal-media-controls-text-track-list-item-input"));
     trackItemInput->setType(InputTypeNames::checkbox);
     trackItemInput->setIntegralAttribute(trackIndexAttrName(), trackIndex);
     if (!mediaElement().textTracksVisible()) {
         if (!track)
             trackItemInput->setChecked(true);
     } else {
         // If there are multiple text tracks set to showing, they must all have
@@ skipping 339 matching lines @@
 }
 
 MediaControlCurrentTimeDisplayElement* MediaControlCurrentTimeDisplayElement::create(MediaControls& mediaControls)
 {
     MediaControlCurrentTimeDisplayElement* element = new MediaControlCurrentTimeDisplayElement(mediaControls);
     element->setShadowPseudoId(AtomicString("-webkit-media-controls-current-time-display"));
     return element;
 }
 
 } // namespace blink