Convert USE_PROPRIETARY_CODECS to a buildflag header.

media/base/mime_util_internal.cc

Index: media/base/mime_util_internal.cc
diff --git a/media/base/mime_util_internal.cc b/media/base/mime_util_internal.cc
index 031d548c7ced5e5e9b85f3f1d36481a2d751d4e7..2a0a957a7d51dd68509fae1654516f1d41ebd0b5 100644
--- a/media/base/mime_util_internal.cc
+++ b/media/base/mime_util_internal.cc
@@ -13,6 +13,7 @@
 #include "media/base/media_client.h"
 #include "media/base/media_switches.h"
 #include "media/base/video_codecs.h"
+#include "media/media_features.h"
 
 #if defined(OS_ANDROID)
 #include "base/android/build_info.h"
@@ -246,7 +247,7 @@ SupportsType MimeUtil::AreSupportedCodecs(
 }
 
 void MimeUtil::InitializeMimeTypeMaps() {
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
   allow_proprietary_codecs_ = true;
 #endif
 
@@ -291,7 +292,7 @@ void MimeUtil::AddSupportedMediaFormats() {
   CodecSet webm_codecs(webm_audio_codecs);
   webm_codecs.insert(webm_video_codecs.begin(), webm_video_codecs.end());
 
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
   CodecSet mp3_codecs;
   mp3_codecs.insert(MP3);
 
@@ -319,7 +320,7 @@ void MimeUtil::AddSupportedMediaFormats() {
   mp4_video_codecs.insert(VP9);
   CodecSet mp4_codecs(mp4_audio_codecs);
   mp4_codecs.insert(mp4_video_codecs.begin(), mp4_video_codecs.end());
-#endif  // defined(USE_PROPRIETARY_CODECS)
+#endif  // BUILDFLAG(USE_PROPRIETARY_CODECS)
 
   AddContainerWithCodecs("audio/wav", wav_codecs, false);
   AddContainerWithCodecs("audio/x-wav", wav_codecs, false);
@@ -335,7 +336,7 @@ void MimeUtil::AddSupportedMediaFormats() {
   AddContainerWithCodecs("application/ogg", ogg_codecs, false);
   AddContainerWithCodecs("audio/flac", implicit_codec, false);
 
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
   AddContainerWithCodecs("audio/mpeg", mp3_codecs, true);  // Allow "mp3".
   AddContainerWithCodecs("audio/mp3", implicit_codec, true);
   AddContainerWithCodecs("audio/x-mp3", implicit_codec, true);
@@ -361,13 +362,13 @@ void MimeUtil::AddSupportedMediaFormats() {
   AddContainerWithCodecs("application/x-mpegurl", hls_codecs, true);
   AddContainerWithCodecs("application/vnd.apple.mpegurl", hls_codecs, true);
 #endif  // defined(OS_ANDROID)
-#endif  // defined(USE_PROPRIETARY_CODECS)
+#endif  // BUILDFLAG(USE_PROPRIETARY_CODECS)
 }
 
 void MimeUtil::AddContainerWithCodecs(const std::string& mime_type,
                                       const CodecSet& codecs,
                                       bool is_proprietary_mime_type) {
-#if !defined(USE_PROPRIETARY_CODECS)
+#if !BUILDFLAG(USE_PROPRIETARY_CODECS)
   DCHECK(!is_proprietary_mime_type);
 #endif