Revert of Turn off error resilience for VP9 if no spatial or temporal layers are configured and NACK is enabl…

webrtc/modules/video_coding/video_codec_initializer.cc

Index: webrtc/modules/video_coding/video_codec_initializer.cc
diff --git a/webrtc/modules/video_coding/video_codec_initializer.cc b/webrtc/modules/video_coding/video_codec_initializer.cc
index 698c89ba805b7224b072c6294b0a70d321690c2e..57f9b268c0429749b3b4e86d0d5497527daf5b0e 100644
--- a/webrtc/modules/video_coding/video_codec_initializer.cc
+++ b/webrtc/modules/video_coding/video_codec_initializer.cc
@@ -21,15 +21,6 @@
 #include "webrtc/system_wrappers/include/clock.h"
 
 namespace webrtc {
-namespace {
-bool TemporalLayersConfigured(const std::vector<VideoStream>& streams) {
-  for (const VideoStream& stream : streams) {
-    if (stream.temporal_layer_thresholds_bps.size() > 0)
-      return true;
-  }
-  return false;
-}
-}  // namespace
 
 bool VideoCodecInitializer::SetupCodec(
     const VideoEncoderConfig& config,
@@ -128,8 +119,12 @@
         *video_codec.VP8() = VideoEncoder::GetDefaultVp8Settings();
       video_codec.VP8()->numberOfTemporalLayers = static_cast<unsigned char>(
           streams.back().temporal_layer_thresholds_bps.size() + 1);
-
-      if (nack_enabled && !TemporalLayersConfigured(streams)) {
+      bool temporal_layers_configured = false;
+      for (const VideoStream& stream : streams) {
+        if (stream.temporal_layer_thresholds_bps.size() > 0)
+          temporal_layers_configured = true;
+      }
+      if (nack_enabled && !temporal_layers_configured) {
         LOG(LS_INFO) << "No temporal layers and nack enabled -> resilience off";
         video_codec.VP8()->resilience = kResilienceOff;
       }
@@ -147,13 +142,6 @@
       }
       video_codec.VP9()->numberOfTemporalLayers = static_cast<unsigned char>(
           streams.back().temporal_layer_thresholds_bps.size() + 1);
-
-      if (nack_enabled && !TemporalLayersConfigured(streams) &&
-          video_codec.VP9()->numberOfSpatialLayers == 1) {
-        LOG(LS_INFO) << "No temporal or spatial layers and nack enabled -> "
-                     << "resilience off";
-        video_codec.VP9()->resilienceOn = false;
-      }
       break;
     }
     case kVideoCodecH264: {