Remove redundant webrtc:: prefixes in api/audio_codecs

Created by
tools_webrtc/remove_extra_namespace.py --namespace webrtc

and manual adjustments.

This CL was uploaded by git cl split.

R=eshr@webrtc.org

No-IWYU: Refactoring
Bug: webrtc:42232595
Change-Id: I8bdab786433ee335bf613e956ebd64ebca4fa986
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/396162
Reviewed-by: Evan Shrubsole <eshr@webrtc.org>
Auto-Submit: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Evan Shrubsole <eshr@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#44910}
diff --git a/api/audio_codecs/audio_format.h b/api/audio_codecs/audio_format.h
index a5d4a92..f7daf76 100644
--- a/api/audio_codecs/audio_format.h
+++ b/api/audio_codecs/audio_format.h
@@ -26,7 +26,7 @@
 
 // SDP specification for a single audio codec.
 struct RTC_EXPORT SdpAudioFormat {
-  using Parameters [[deprecated("Use webrtc::CodecParameterMap")]] =
+  using Parameters [[deprecated("Use CodecParameterMap")]] =
       std::map<std::string, std::string>;
 
   SdpAudioFormat(const SdpAudioFormat&);