Bug 1322358: Don't disable m-sections in answer just because they're inactive. r=drno

MozReview-Commit-ID: 6YPwEk7bwIG

--HG--
extra : rebase_source : 30f843a0f73f0871b92e47de63f9c8a38588dd3c

media/webrtc/signaling/src/jsep/JsepSessionImpl.cpp

@@ -1005,11 +1005,6 @@ JsepSessionImpl::CreateAnswerMSection(const JsepAnswerOptions& options,
     BindMatchingRemoteTrackToAnswer(&msection);
   }
 
-  if (!msection.IsReceiving() && !msection.IsSending()) {
-    mSdpHelper.DisableMsection(sdp, &msection);
-    return NS_OK;
-  }
-
   // Add extmap attributes.
   AddCommonExtmaps(remoteMsection, &msection);