Remove MediaStream label, ended attributes and stop() method

LayoutTests/fast/mediastream/MediaStreamConstructor.html

Index: LayoutTests/fast/mediastream/MediaStreamConstructor.html
diff --git a/LayoutTests/fast/mediastream/MediaStreamConstructor.html b/LayoutTests/fast/mediastream/MediaStreamConstructor.html
index 324c389253cb938cf1e131bd89a62b1f5f5197c8..2a1218988a0b3af8b7cca0b8345884ac1140372b 100644
--- a/LayoutTests/fast/mediastream/MediaStreamConstructor.html
+++ b/LayoutTests/fast/mediastream/MediaStreamConstructor.html
@@ -94,7 +94,11 @@ function testConstructor(s) {
         finishJSTest();
     };
 
-    s.stop();
+    for (var i = 0; i < s.getAudioTracks().length; i++)

[philipj_slow, 2015/08/27 14:34:54]

Ditto.

[shiva.jm, 2015/08/28 04:40:23]

Done.

+        s.getAudioTracks()[i].stop();
+
+    for (var i = 0; i < s.getVideoTracks().length; i++)
+        s.getVideoTracks()[i].stop();
 }
 
 function verifyStream(s, numAudioTracks, numVideoTracks) {