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

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

 /*
  *  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 70 matching lines @@
     // intentional.
     info.redundant.push_back(info);
     DCHECK_EQ(info.redundant.size(), 1u);
     if (secondary_info_.encoded_bytes > 0) {
       memcpy(&encoded[info.encoded_bytes], secondary_encoded_.data(),
              secondary_info_.encoded_bytes);
       info.redundant.push_back(secondary_info_);
       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);
   }
   // Update main EncodedInfo.
   info.payload_type = red_payload_type_;
   info.encoded_bytes = 0;
   for (std::vector<EncodedInfoLeaf>::const_iterator it = info.redundant.begin();
        it != info.redundant.end(); ++it) {
     info.encoded_bytes += it->encoded_bytes;
   }
   return info;
 }
 
 }  // namespace webrtc