Convert USE_PROPRIETARY_CODECS to a buildflag header.

media/base/key_systems.cc

Index: media/base/key_systems.cc
diff --git a/media/base/key_systems.cc b/media/base/key_systems.cc
index 2bd244a1e38c2da85b2990324da9e65a71a7788d..ef16ad65fbdc6bab3830ea998e7f9c7f5ec402ee 100644
--- a/media/base/key_systems.cc
+++ b/media/base/key_systems.cc
@@ -22,6 +22,7 @@
 #include "media/base/media_switches.h"
 #include "ppapi/features/features.h"
 #include "media/base/media_client.h"
+#include "media/media_features.h"
 #include "third_party/widevine/cdm/widevine_cdm_common.h"
 
 namespace media {
@@ -43,10 +44,10 @@ struct NamedCodec {
 static const NamedCodec kMimeTypeToCodecMasks[] = {
     {"audio/webm", EME_CODEC_WEBM_AUDIO_ALL},
     {"video/webm", EME_CODEC_WEBM_VIDEO_ALL},
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
     {"audio/mp4", EME_CODEC_MP4_AUDIO_ALL},
     {"video/mp4", EME_CODEC_MP4_VIDEO_ALL}
-#endif  // defined(USE_PROPRIETARY_CODECS)
+#endif  // BUILDFLAG(USE_PROPRIETARY_CODECS)
 };
 
 // Mapping between codec names and enum values.
@@ -57,7 +58,7 @@ static const NamedCodec kCodecStrings[] = {
     {"vp8.0", EME_CODEC_WEBM_VP8},      // VP8.
     {"vp9", EME_CODEC_WEBM_VP9},        // VP9.
     {"vp9.0", EME_CODEC_WEBM_VP9},      // VP9.
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
     {"vp09", EME_CODEC_MP4_VP9},   // VP9 in MP4.
     {"mp4a", EME_CODEC_MP4_AAC},   // AAC.
     {"avc1", EME_CODEC_MP4_AVC1},  // AVC1.
@@ -66,7 +67,7 @@ static const NamedCodec kCodecStrings[] = {
     {"hev1", EME_CODEC_MP4_HEVC},  // HEV1.
     {"hvc1", EME_CODEC_MP4_HEVC},  // HVC1.
 #endif
-#endif  // defined(USE_PROPRIETARY_CODECS)
+#endif  // BUILDFLAG(USE_PROPRIETARY_CODECS)
 };
 
 class ClearKeyProperties : public KeySystemProperties {
@@ -74,7 +75,7 @@ class ClearKeyProperties : public KeySystemProperties {
   std::string GetKeySystemName() const override { return kClearKeyKeySystem; }
 
   bool IsSupportedInitDataType(EmeInitDataType init_data_type) const override {
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
     if (init_data_type == EmeInitDataType::CENC)
       return true;
 #endif
@@ -88,9 +89,9 @@ class ClearKeyProperties : public KeySystemProperties {
     // VP9 support is device dependent.
     SupportedCodecs codecs = EME_CODEC_WEBM_ALL;
 
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
     codecs |= EME_CODEC_MP4_ALL;
-#endif  // defined(USE_PROPRIETARY_CODECS)
+#endif  // BUILDFLAG(USE_PROPRIETARY_CODECS)
 
     return codecs;
   }