Removing `preference` field from `cricket::Codec`.

webrtc/api/jsepsessiondescription_unittest.cc

Index: webrtc/api/jsepsessiondescription_unittest.cc
diff --git a/webrtc/api/jsepsessiondescription_unittest.cc b/webrtc/api/jsepsessiondescription_unittest.cc
index 3d8751373116c42bcdcf8fece530800719e6d880..8f9fc5427f40d96f31dad60843edebb5e9fe1130 100644
--- a/webrtc/api/jsepsessiondescription_unittest.cc
+++ b/webrtc/api/jsepsessiondescription_unittest.cc
@@ -48,11 +48,11 @@ static cricket::SessionDescription* CreateCricketSessionDescription() {
   scoped_ptr<cricket::VideoContentDescription> video(
       new cricket::VideoContentDescription());
 
-  audio->AddCodec(cricket::AudioCodec(103, "ISAC", 16000, 0, 0, 0));
+  audio->AddCodec(cricket::AudioCodec(103, "ISAC", 16000, 0, 0));
   desc->AddContent(cricket::CN_AUDIO, cricket::NS_JINGLE_RTP,
                    audio.release());
 
-  video->AddCodec(cricket::VideoCodec(120, "VP8", 640, 480, 30, 0));
+  video->AddCodec(cricket::VideoCodec(120, "VP8", 640, 480, 30));
   desc->AddContent(cricket::CN_VIDEO, cricket::NS_JINGLE_RTP,
                    video.release());