Bug 1534683: Re-enable and fix this test-case. r=jib

Depends on D23208

Differential Revision: https://phabricator.services.mozilla.com/D24051

--HG--
extra : moz-landing-system : lando

testing/web-platform/meta/webrtc/protocol/msid-parse.html.ini

@@ -1,17 +0,0 @@
-[msid-parse.html]
-  [Description with no msid produces a track with a stream]
-    expected: FAIL
-    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1534683
-
-  [Description with two msid produces two streams]
-    expected: FAIL
-    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1534683
-
-  [Description with msid:foo bar produces a stream with id foo]
-    expected: FAIL
-    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1534683
-
-  [Description with msid:- appid produces a track with no stream]
-    expected: FAIL
-    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1534683
-

testing/web-platform/tests/webrtc/protocol/msid-parse.html

@@ -14,10 +14,12 @@ a=fingerprint:sha-256 A7:24:72:CA:6E:02:55:39:BA:66:DF:6E:CC:4C:D8:B0:1A:BF:1A:5
 a=ice-ufrag:6HHHdzzeIhkE0CKj
 a=ice-pwd:XYDGVpfvklQIEnZ6YnyLsAew
 m=video 1 RTP/SAVPF 100
+c=IN IP4 0.0.0.0
 a=rtcp-mux
 a=sendonly
 a=mid:video
 a=rtpmap:100 VP8/30
+a=setup:actpass
 `;