Remove RED/RTX workaround from sender/receiver and VideoEngine2.

webrtc/media/engine/webrtcvideoengine2.h

Index: webrtc/media/engine/webrtcvideoengine2.h
diff --git a/webrtc/media/engine/webrtcvideoengine2.h b/webrtc/media/engine/webrtcvideoengine2.h
index ef893d2e98fa2ee1ae60d45cd41b02277ac8b9ea..74a1311ea13bb36b3ca28738993015d8a7a3c2b5 100644
--- a/webrtc/media/engine/webrtcvideoengine2.h
+++ b/webrtc/media/engine/webrtcvideoengine2.h
@@ -389,8 +389,7 @@ class WebRtcVideoChannel2 : public VideoMediaChannel, public webrtc::Transport {
         webrtc::VideoReceiveStream::Config config,
         WebRtcVideoDecoderFactory* external_decoder_factory,
         bool default_stream,
-        const std::vector<VideoCodecSettings>& recv_codecs,
-        bool red_disabled_by_remote_side);
+        const std::vector<VideoCodecSettings>& recv_codecs);
     ~WebRtcVideoReceiveStream();
 
     const std::vector<uint32_t>& GetSsrcs() const;
@@ -411,14 +410,6 @@ class WebRtcVideoChannel2 : public VideoMediaChannel, public webrtc::Transport {
 
     VideoReceiverInfo GetVideoReceiverInfo(bool log_stats);
 
-    // Used to disable RED/FEC when the remote description doesn't contain those
-    // codecs. This is needed to be able to work around an RTX bug which is only
-    // happening if the remote side doesn't send RED, but the local side is
-    // configured to receive RED.
-    // TODO(holmer): Remove this after a couple of Chrome versions, M53-54
-    // time frame.
-    void SetUlpfecDisabledRemotely(bool disable);
-
    private:
     struct AllocatedDecoder {
       AllocatedDecoder(webrtc::VideoDecoder* decoder,
@@ -448,7 +439,6 @@ class WebRtcVideoChannel2 : public VideoMediaChannel, public webrtc::Transport {
     webrtc::VideoReceiveStream* stream_;
     const bool default_stream_;
     webrtc::VideoReceiveStream::Config config_;
-    bool red_disabled_by_remote_side_;
 
     WebRtcVideoDecoderFactory* const external_decoder_factory_;
     std::vector<AllocatedDecoder> allocated_decoders_;
@@ -521,7 +511,6 @@ class WebRtcVideoChannel2 : public VideoMediaChannel, public webrtc::Transport {
   VideoSendParameters send_params_;
   VideoOptions default_send_options_;
   VideoRecvParameters recv_params_;
-  bool red_disabled_by_remote_side_;
   int64_t last_stats_log_ms_;
 };