Removed an obsolete DCHECK in AudioEncoderOpus.

webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc

Index: webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
diff --git a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
index 9b3a367c0f278383a6b79139c2d994c9a04eda39..5b9a8953325a2f140a8f3501a52e5ae3c486c3c4 100644
--- a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
+++ b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
@@ -729,8 +729,6 @@ void AudioEncoderOpus::SetTargetBitrate(int bits_per_second) {
 
 void AudioEncoderOpus::ApplyAudioNetworkAdaptor() {
   auto config = audio_network_adaptor_->GetEncoderRuntimeConfig();
-  RTC_DCHECK(!config.frame_length_ms || *config.frame_length_ms == 20 ||
-             *config.frame_length_ms == 60);
 
   if (config.bitrate_bps)
     SetTargetBitrate(*config.bitrate_bps);