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

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

Index: webrtc/modules/audio_coding/main/acm2/rent_a_codec.h
diff --git a/webrtc/modules/audio_coding/main/acm2/rent_a_codec.h b/webrtc/modules/audio_coding/main/acm2/rent_a_codec.h
index 55a5d0361a9958ff050aa872ea18ac9c1304d1d6..02749f7423fbc5500f01af2eb175b546202084d2 100644
--- a/webrtc/modules/audio_coding/main/acm2/rent_a_codec.h
+++ b/webrtc/modules/audio_coding/main/acm2/rent_a_codec.h
@@ -133,12 +133,14 @@ class RentACodec {
 
   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>();
   }