Bug 1157766: mismatched DataChannel initial channel size in JSEP database breaks adding channels r=bwc

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

@@ -24,6 +24,7 @@
 #include "signaling/src/sdp/Sdp.h"
 #include "signaling/src/sdp/SipccSdp.h"
 #include "signaling/src/sdp/SipccSdpParser.h"
+#include "mozilla/net/DataChannelProtocol.h"
 
 namespace mozilla {
 
@@ -2432,7 +2433,7 @@ JsepSessionImpl::SetupDefaultCodecs()
   mCodecs.values.push_back(new JsepApplicationCodecDescription(
       "5000",
       "webrtc-datachannel",
-      16
+      WEBRTC_DATACHANNEL_STREAMS_DEFAULT
       ));
 }