Never create HTMLTrackElement when VideoTrack is not enabled

Source/core/html/HTMLMediaElement.cpp

Index: Source/core/html/HTMLMediaElement.cpp
diff --git a/Source/core/html/HTMLMediaElement.cpp b/Source/core/html/HTMLMediaElement.cpp
index 5a0227cb669e184b2489cf827e58db18cc88db05..804c6de2ea38e8b6ced6270348ec4e21717a2406 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -616,6 +616,9 @@ void HTMLMediaElement::load()
 
     LOG(Media, "HTMLMediaElement::load()");
 
+    if (document().settings() && !document().settings()->mediaEnabled())
+        return;
+
     if (userGestureRequiredForLoad() && !UserGestureIndicator::processingUserGesture())
         return;