Remove incompatiblities with absl::optional in audio_coding

PCMFile.cc uses RTC_DCHECK. include and depend on rtc_base:checks target directly

change usage of value_or by using explicit constructor instead of implicit

Bug: webrtc:9078
Change-Id: I63c596b8a05b387e56df846b15c33a605fbad4e6
Reviewed-on: https://webrtc-review.googlesource.com/69985
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22897}
diff --git a/modules/audio_coding/neteq/decoder_database.cc b/modules/audio_coding/neteq/decoder_database.cc
index 40b0dc7..5b940ae 100644
--- a/modules/audio_coding/neteq/decoder_database.cc
+++ b/modules/audio_coding/neteq/decoder_database.cc
@@ -230,7 +230,8 @@
   }
 
   const auto opt_db_format = NetEqDecoderToSdpAudioFormat(codec_type);
-  const SdpAudioFormat format = opt_db_format.value_or({"arbitrary", 0, 0});
+  const SdpAudioFormat format =
+      opt_db_format.value_or(SdpAudioFormat("arbitrary", 0, 0));
 
   std::pair<DecoderMap::iterator, bool> ret;
   DecoderInfo info(format, decoder, codec_name);