Move usage of QualityScaler to ViEEncoder.

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 52 matching lines @@
 
   // Free encoder memory.
   //
   // Return value                : WEBRTC_VIDEO_CODEC_OK if OK, < 0 otherwise.
   int Release() override;
 
   int SetChannelParameters(uint32_t /*packetLoss*/, int64_t /*rtt*/) 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 51 matching lines @@
   VideoFrame _decodedImage;
   int _width;
   int _height;
   bool _inited;
   DecodedImageCallback* _decodeCompleteCallback;
 };  // class I420Decoder
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_I420_INCLUDE_I420_H_