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

webrtc/media/base/codec.h

Index: webrtc/media/base/codec.h
diff --git a/webrtc/media/base/codec.h b/webrtc/media/base/codec.h
index 7476c026942761d48a4fd0172b24331a0e6931e7..c79a3fafc8f754cd9f1ce3f3e708b095155eb316 100644
--- a/webrtc/media/base/codec.h
+++ b/webrtc/media/base/codec.h
@@ -64,12 +64,11 @@ struct Codec {
   int id;
   std::string name;
   int clockrate;
-  int preference;
   CodecParameterMap params;
   FeedbackParams feedback_params;
 
   // Creates a codec with the given parameters.
-  Codec(int id, const std::string& name, int clockrate, int preference);
+  Codec(int id, const std::string& name, int clockrate);
   // Creates an empty codec.
   Codec();
   Codec(const Codec& c);
@@ -92,10 +91,6 @@ struct Codec {
   bool HasFeedbackParam(const FeedbackParam& param) const;
   void AddFeedbackParam(const FeedbackParam& param);
 
-  static bool Preferable(const Codec& first, const Codec& other) {
-    return first.preference > other.preference;
-  }
-
   // Filter |this| feedbacks params such that only those shared by both |this|
   // and |other| are kept.
   void IntersectFeedbackParams(const Codec& other);
@@ -118,8 +113,7 @@ struct AudioCodec : public Codec {
              const std::string& name,
              int clockrate,
              int bitrate,
-             size_t channels,
-             int preference);
+             size_t channels);
   // Creates an empty codec.
   AudioCodec();
   AudioCodec(const AudioCodec& c);
@@ -128,10 +122,6 @@ struct AudioCodec : public Codec {
   // Indicates if this codec is compatible with the specified codec.
   bool Matches(const AudioCodec& codec) const;
 
-  static bool Preferable(const AudioCodec& first, const AudioCodec& other) {
-    return first.preference > other.preference;
-  }
-
   std::string ToString() const;
 
   AudioCodec& operator=(const AudioCodec& c);
@@ -153,18 +143,13 @@ struct VideoCodec : public Codec {
              const std::string& name,
              int width,
              int height,
-             int framerate,
-             int preference);
+             int framerate);
   VideoCodec(int id, const std::string& name);
   // Creates an empty codec.
   VideoCodec();
   VideoCodec(const VideoCodec& c);
   ~VideoCodec() = default;
 
-  static bool Preferable(const VideoCodec& first, const VideoCodec& other) {
-    return first.preference > other.preference;
-  }
-
   std::string ToString() const;
 
   VideoCodec& operator=(const VideoCodec& c);
@@ -193,7 +178,7 @@ struct VideoCodec : public Codec {
 };
 
 struct DataCodec : public Codec {
-  DataCodec(int id, const std::string& name, int preference);
+  DataCodec(int id, const std::string& name);
   DataCodec();
   DataCodec(const DataCodec& c);