Bug 1536631 - Part 5: Stop expecting a couple of wpt to fail. r=jib

Differential Revision: https://phabricator.services.mozilla.com/D25150

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

testing/web-platform/meta/webrtc/RTCPeerConnection-setLocalDescription-answer.html.ini

@@ -1,5 +0,0 @@
-[RTCPeerConnection-setLocalDescription-answer.html]
-  [setLocalDescription() with answer not created by own createAnswer() should reject with InvalidModificationError]
-    expected: FAIL
-    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1531118, https://bugzilla.mozilla.org/show_bug.cgi?id=1095226
-

testing/web-platform/meta/webrtc/RTCPeerConnection-setLocalDescription-offer.html.ini

@@ -1,12 +1,4 @@
 [RTCPeerConnection-setLocalDescription-offer.html]
-  [setLocalDescription() with offer not created by own createOffer() should reject with InvalidModificationError]
-    expected: FAIL
-    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1531134
-
-  [Set created offer other than last offer should reject with InvalidModificationError]
-    expected: FAIL
-    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1531134
-
   [Creating and setting offer multiple times should succeed]
     expected: FAIL
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1072388