Make CodecType conversion functions non-optional.

webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCVideoEncoderSettings.mm

 /*
  *  Copyright 2017 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 12 matching lines @@
 @synthesize maxBitrate = _maxBitrate;
 @synthesize minBitrate = _minBitrate;
 @synthesize targetBitrate = _targetBitrate;
 @synthesize maxFramerate = _maxFramerate;
 @synthesize qpMax = _qpMax;
 @synthesize mode = _mode;
 
 - (instancetype)initWithNativeVideoCodec:(const webrtc::VideoCodec *)videoCodec {
   if (self = [super init]) {
     if (videoCodec) {
-      rtc::Optional<const char *> codecName = CodecTypeToPayloadName(videoCodec->codecType);
-      if (codecName) {
-        _name = [NSString stringWithUTF8String:codecName.value()];
-      }
+      const char *codecName = CodecTypeToPayloadString(videoCodec->codecType);
+      _name = [NSString stringWithUTF8String:codecName];
 
       _width = videoCodec->width;
       _height = videoCodec->height;
       _startBitrate = videoCodec->startBitrate;
       _maxBitrate = videoCodec->maxBitrate;
       _minBitrate = videoCodec->minBitrate;
       _targetBitrate = videoCodec->targetBitrate;
       _maxFramerate = videoCodec->maxFramerate;
       _qpMax = videoCodec->qpMax;
       _mode = (RTCVideoCodecMode)videoCodec->mode;
     }
   }
 
   return self;
 }
 
 @end