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

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

 /*
  *  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 85 matching lines @@
 
     kNone = -1
   };
 
   static inline size_t NumberOfCodecs() {
     return static_cast<size_t>(CodecId::kNumCodecs);
   }
 
   static inline rtc::Maybe<int> CodecIndexFromId(CodecId codec_id) {
     const int i = static_cast<int>(codec_id);
-    return i < static_cast<int>(NumberOfCodecs()) ? i : rtc::Maybe<int>();
+    return i < static_cast<int>(NumberOfCodecs()) ? rtc::Maybe<int>(i)
+                                                  : rtc::Maybe<int>();
   }
 
   static inline rtc::Maybe<CodecId> CodecIdFromIndex(int codec_index) {
     return static_cast<size_t>(codec_index) < NumberOfCodecs()
-               ? static_cast<RentACodec::CodecId>(codec_index)
+               ? rtc::Maybe<RentACodec::CodecId>(
+                     static_cast<RentACodec::CodecId>(codec_index))
                : rtc::Maybe<RentACodec::CodecId>();
   }
 
   static rtc::Maybe<CodecId> CodecIdByParams(const char* payload_name,
                                              int sampling_freq_hz,
                                              int channels);
   static rtc::Maybe<CodecInst> CodecInstById(CodecId codec_id);
   static rtc::Maybe<CodecInst> CodecInstByParams(const char* payload_name,
                                                  int sampling_freq_hz,
                                                  int channels);
   static bool IsCodecValid(const CodecInst& codec_inst);
   static rtc::ArrayView<const CodecInst> Database();
 };
 
 }  // namespace acm2
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_RENT_A_CODEC_H_