Replace rtc::cricket::Settable with rtc::Maybe

webrtc/modules/audio_coding/main/acm2/rent_a_codec.cc

 /*
  *  Copyright (c) 2015 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 43 matching lines @@
   return rtc::ArrayView<const CodecInst>(ACMCodecDB::database_,
                                          NumberOfCodecs());
 }
 
 rtc::Maybe<NetEqDecoder> RentACodec::NetEqDecoderFromCodecId(CodecId codec_id,
                                                              int num_channels) {
   rtc::Maybe<int> i = CodecIndexFromId(codec_id);
   if (!i)
     return rtc::Maybe<NetEqDecoder>();
   const NetEqDecoder ned = ACMCodecDB::neteq_decoders_[*i];
-  return (ned == NetEqDecoder::kDecoderOpus && num_channels == 2)
-             ? NetEqDecoder::kDecoderOpus_2ch
-             : ned;
+  return rtc::Maybe<NetEqDecoder>(
+      (ned == NetEqDecoder::kDecoderOpus && num_channels == 2)
+          ? NetEqDecoder::kDecoderOpus_2ch
+          : ned);
 }
 
 }  // namespace acm2
 }  // namespace webrtc