Drop LABEL element from form-associated elements.

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

Index: third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp b/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
index ce9656d6ba3edb722313fc57ae644dac922a45a8..7328980eb2701df140b1164bf83d75bfffdfc960 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
@@ -499,7 +499,7 @@ String MediaControlTextTrackListElement::getTextTrackLabel(TextTrack* track)
 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"));