copy-red: Fill an rtc::Buffer with bytes the easy way

webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc

Index: webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
diff --git a/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc b/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
index dccaf4306157a32e17e6cf240a2203c823414c66..96ec3ccf42d9b85c80407b993ab64eff9d9554e6 100644
--- a/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
+++ b/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
@@ -88,8 +88,7 @@ AudioEncoder::EncodedInfo AudioEncoderCopyRed::EncodeInternal(
       DCHECK_EQ(info.redundant.size(), 2u);
     }
     // Save primary to secondary.
-    secondary_encoded_.SetSize(info.encoded_bytes);
-    memcpy(secondary_encoded_.data(), encoded, info.encoded_bytes);
+    secondary_encoded_.SetData(encoded, info.encoded_bytes);
     secondary_info_ = info;
     DCHECK_EQ(info.speech, info.redundant[0].speech);
   }