Remove dead code in vp8_impl files.

webrtc/modules/video_coding/codecs/vp8/simulcast_unittest.h

 /*
  *  Copyright (c) 2014 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 206 matching lines @@
     ConfigureStream(kDefaultWidth / 2, kDefaultHeight / 2, kMaxBitrates[1],
                     kMinBitrates[1], kTargetBitrates[1],
                     &settings->simulcastStream[1], temporal_layer_profile[1]);
     ConfigureStream(kDefaultWidth, kDefaultHeight, kMaxBitrates[2],
                     kMinBitrates[2], kTargetBitrates[2],
                     &settings->simulcastStream[2], temporal_layer_profile[2]);
     settings->VP8()->resilience = kResilientStream;
     settings->VP8()->denoisingOn = true;
     settings->VP8()->errorConcealmentOn = false;
     settings->VP8()->automaticResizeOn = false;
-    settings->VP8()->feedbackModeOn = false;
     settings->VP8()->frameDroppingOn = true;
     settings->VP8()->keyFrameInterval = 3000;
   }
 
   static void ConfigureStream(int width,
                               int height,
                               int max_bitrate,
                               int min_bitrate,
                               int target_bitrate,
                               SimulcastStream* stream,
@@ skipping 652 matching lines @@
   VideoCodec settings_;
   rtc::scoped_refptr<I420Buffer> input_buffer_;
   std::unique_ptr<VideoFrame> input_frame_;
   std::unique_ptr<SimulcastRateAllocator> rate_allocator_;
 };
 
 }  // namespace testing
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_SIMULCAST_UNITTEST_H_