Bug 1464917 - Allow maxPacketLifeTime and maxRetransmits to be zero; r=drno

MozReview-Commit-ID: HtYGXPy6pZ

--HG--
extra : rebase_source : 75e153fbf3841d20f7fca80de6905b7ee96f688b

dom/media/PeerConnection.js

@@ -1581,9 +1581,9 @@ class RTCPeerConnection {
     }
     // Must determine the type where we still know if entries are undefined.
     let type;
-    if (maxPacketLifeTime) {
+    if (maxPacketLifeTime !== undefined) {
       type = Ci.IPeerConnection.kDataChannelPartialReliableTimed;
-    } else if (maxRetransmits) {
+    } else if (maxRetransmits !== undefined) {
       type = Ci.IPeerConnection.kDataChannelPartialReliableRexmit;
     } else {
       type = Ci.IPeerConnection.kDataChannelReliable;