Make CodecType conversion functions non-optional.

webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.h

 /*
  *  Copyright (c) 2012 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 181 matching lines @@
         config_.input_filename, config_.codec_settings.width,
         config_.codec_settings.height));
     analysis_frame_writer_.reset(new YuvFrameWriterImpl(
         config_.output_filename, config_.codec_settings.width,
         config_.codec_settings.height));
     EXPECT_TRUE(analysis_frame_reader_->Init());
     EXPECT_TRUE(analysis_frame_writer_->Init());
 
     if (visualization_params) {
       const std::string codec_name =
-          CodecTypeToPayloadName(config_.codec_settings.codecType)
-              .value_or("unknown");
+          CodecTypeToPayloadString(config_.codec_settings.codecType);
       const std::string implementation_type = config_.hw_codec ? "hw" : "sw";
       // clang-format off
       const std::string output_filename_base =
           OutputPath() + config_.filename + "-" +
           codec_name + "-" + implementation_type + "-" +
           std::to_string(initial_bitrate_kbps);
       // clang-format on
       if (visualization_params->save_encoded_ivf) {
         rtc::File post_encode_file =
             rtc::File::Create(output_filename_base + ".ivf");
@@ skipping 508 matching lines @@
   float target_size_key_frame_initial_;
   float target_size_key_frame_;
   float sum_key_frame_size_mismatch_;
   int num_key_frames_;
 };
 
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_TEST_VIDEOPROCESSOR_INTEGRATIONTEST_H_