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

webrtc/media/base/fakemediaengine.h

Index: webrtc/media/base/fakemediaengine.h
diff --git a/webrtc/media/base/fakemediaengine.h b/webrtc/media/base/fakemediaengine.h
index 6feaf8e989f7e3e1569cfb060c816a6d651ba309..21a49b6cb0ef428d78573f147a7d87f835cdc252 100644
--- a/webrtc/media/base/fakemediaengine.h
+++ b/webrtc/media/base/fakemediaengine.h
@@ -700,7 +700,7 @@ class FakeVoiceEngine : public FakeBaseEngine {
       : output_volume_(-1) {
     // Add a fake audio codec. Note that the name must not be "" as there are
     // sanity checks against that.
-    codecs_.push_back(AudioCodec(101, "fake_audio_codec", 0, 0, 1, 0));
+    codecs_.push_back(AudioCodec(101, "fake_audio_codec", 0, 0, 1));
   }
   bool Init(rtc::Thread* worker_thread) { return true; }
   void Terminate() {}
@@ -763,7 +763,7 @@ class FakeVideoEngine : public FakeBaseEngine {
   FakeVideoEngine() : capture_(false) {
     // Add a fake video codec. Note that the name must not be "" as there are
     // sanity checks against that.
-    codecs_.push_back(VideoCodec(0, "fake_video_codec", 0, 0, 0, 0));
+    codecs_.push_back(VideoCodec(0, "fake_video_codec", 0, 0, 0));
   }
   void Init() {}
   bool SetOptions(const VideoOptions& options) {