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

talk/app/webrtc/localaudiosource.cc

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 31 matching lines @@
 // Convert constraints to audio options. Return false if constraints are
 // invalid.
 void FromConstraints(const MediaConstraintsInterface::Constraints& constraints,
                      cricket::AudioOptions* options) {
   // This design relies on the fact that all the audio constraints are actually
   // "options", i.e. boolean-valued and always satisfiable.  If the constraints
   // are extended to include non-boolean values or actual format constraints,
   // a different algorithm will be required.
   struct {
     const char* name;
-    cricket::Settable<bool>& value;
+    rtc::Maybe<bool>& value;
   } key_to_value[] = {
       {MediaConstraintsInterface::kGoogEchoCancellation,
        options->echo_cancellation},
       {MediaConstraintsInterface::kExtendedFilterEchoCancellation,
        options->extended_filter_aec},
       {MediaConstraintsInterface::kDAEchoCancellation,
        options->delay_agnostic_aec},
       {MediaConstraintsInterface::kAutoGainControl, options->auto_gain_control},
       {MediaConstraintsInterface::kExperimentalAutoGainControl,
        options->experimental_agc},
       {MediaConstraintsInterface::kNoiseSuppression,
        options->noise_suppression},
       {MediaConstraintsInterface::kExperimentalNoiseSuppression,
        options->experimental_ns},
       {MediaConstraintsInterface::kHighpassFilter, options->highpass_filter},
       {MediaConstraintsInterface::kTypingNoiseDetection,
        options->typing_detection},
       {MediaConstraintsInterface::kAudioMirroring, options->stereo_swapping},
       {MediaConstraintsInterface::kAecDump, options->aec_dump}
   };
 
   for (const auto& constraint : constraints) {
     bool value = false;
     if (!rtc::FromString(constraint.value, &value))
       continue;
 
     for (auto& entry : key_to_value) {
       if (constraint.key.compare(entry.name) == 0)
-        entry.value.Set(value);
+        entry.value = rtc::Maybe<bool>(value);
     }
   }
 }
 
 }  // namespace
 
 rtc::scoped_refptr<LocalAudioSource> LocalAudioSource::Create(
     const PeerConnectionFactoryInterface::Options& options,
     const MediaConstraintsInterface* constraints) {
   rtc::scoped_refptr<LocalAudioSource> source(
@@ skipping 12 matching lines @@
   // constraints.
   FromConstraints(constraints->GetOptional(), &options_);
 
   cricket::AudioOptions mandatory_options;
   FromConstraints(constraints->GetMandatory(), &mandatory_options);
   options_.SetAll(mandatory_options);
   source_state_ = kLive;
 }
 
 }  // namespace webrtc