Remove redudant encoder rate calls.

webrtc/modules/video_coding/codecs/i420/include/i420.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 55 matching lines @@
   int Release() override;
 
   int SetRates(uint32_t /*newBitRate*/, uint32_t /*frameRate*/) override {
     return WEBRTC_VIDEO_CODEC_OK;
   }
 
   int SetChannelParameters(uint32_t /*packetLoss*/, int64_t /*rtt*/) override {
     return WEBRTC_VIDEO_CODEC_OK;
   }
 
-  int CodecConfigParameters(uint8_t* /*buffer*/, int /*size*/) override {
-    return WEBRTC_VIDEO_CODEC_OK;
-  }
-
   void OnDroppedFrame() override {}
 
  private:
   static uint8_t* InsertHeader(uint8_t* buffer, uint16_t width,
                                uint16_t height);
 
   bool                     _inited;
   EncodedImage             _encodedImage;
   EncodedImageCallback*    _encodedCompleteCallback;
 };  // class I420Encoder
@@ skipping 58 matching lines @@
   VideoFrame _decodedImage;
   int                         _width;
   int                         _height;
   bool                        _inited;
   DecodedImageCallback*       _decodeCompleteCallback;
 };  // class I420Decoder
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_I420_MAIN_INTERFACE_I420_H_