Bug 1478285 [wpt PR 12179] - Update wpt metadata, a=testonly

wpt-pr: 12179
wpt-type: metadata

testing/web-platform/meta/webrtc/RTCPeerConnection-getStats.https.html.ini

@@ -29,3 +29,6 @@
   [getStats() with connected peer connections having tracks and data channel should return all mandatory to implement stats]
     expected: FAIL
 
+  [getStats() with track added via addTransceiver should succeed]
+    expected: FAIL
+

testing/web-platform/meta/webrtc/RTCPeerConnection-removeTrack.https.html.ini

@@ -5,3 +5,21 @@
   [Calling removeTrack with currentDirection recvonly should not change direction]
     expected: FAIL
 
+  [addTransceiver - Calling removeTrack when connection is closed should throw InvalidStateError]
+    expected: FAIL
+
+  [addTransceiver - Calling removeTrack on different connection that is closed should throw InvalidStateError]
+    expected: FAIL
+
+  [addTransceiver - Calling removeTrack on different connection should throw InvalidAccessError]
+    expected: FAIL
+
+  [addTransceiver - Calling removeTrack with valid sender should set sender.track to null]
+    expected: FAIL
+
+  [Calling removeTrack with currentDirection sendonly should set direction to inactive]
+    expected: FAIL
+
+  [Calling removeTrack with currentDirection inactive should not change direction]
+    expected: FAIL
+