Sync audio/video/text track-related interfaces with the specs

Source/core/html/track/vtt/VTTRegion.idl

 /*
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+// http://dev.w3.org/html5/webvtt/#the-vttregion-interface
+
 [
     Constructor,
     RuntimeEnabled=WebVTTRegions,
     WillBeGarbageCollected,
 ] interface VTTRegion {
-    readonly attribute TextTrack track;
-
-    attribute DOMString id;
     [RaisesException=Setter] attribute double width;
+    // TODO(philipj): height should be called lines.
     [RaisesException=Setter] attribute long height;
     [RaisesException=Setter] attribute double regionAnchorX;
     [RaisesException=Setter] attribute double regionAnchorY;
     [RaisesException=Setter] attribute double viewportAnchorX;
     [RaisesException=Setter] attribute double viewportAnchorY;
+    // TODO(philip): scroll should be of type ScrollSetting.
     [RaisesException=Setter] attribute DOMString scroll;
+
+    // TODO(philipj): The track/id attributes are gone from the spec:
+    // https://www.w3.org/Bugs/Public/show_bug.cgi?id=24380
+    readonly attribute TextTrack track;
+    attribute DOMString id;
 };