Revert of Convert USE_PROPRIETARY_CODECS to a buildflag header.

components/cdm/renderer/widevine_key_system_properties.cc

Index: components/cdm/renderer/widevine_key_system_properties.cc
diff --git a/components/cdm/renderer/widevine_key_system_properties.cc b/components/cdm/renderer/widevine_key_system_properties.cc
index c16e8e7828f51173481e45b1196292ae846d40d2..276f6238efa1348ffd7ce8be3789a0ee7390c316 100644
--- a/components/cdm/renderer/widevine_key_system_properties.cc
+++ b/components/cdm/renderer/widevine_key_system_properties.cc
@@ -4,7 +4,6 @@
 
 #include "components/cdm/renderer/widevine_key_system_properties.h"
 
-#include "media/media_features.h"
 #include "ppapi/features/features.h"
 #include "widevine_cdm_version.h"  // In SHARED_INTERMEDIATE_DIR.
 
@@ -73,10 +72,10 @@
   // |init_data_type| x |container| pairings.
   if (init_data_type == EmeInitDataType::WEBM)
     return (supported_codecs_ & media::EME_CODEC_WEBM_ALL) != 0;
-#if BUILDFLAG(USE_PROPRIETARY_CODECS)
+#if defined(USE_PROPRIETARY_CODECS)
   if (init_data_type == EmeInitDataType::CENC)
     return (supported_codecs_ & media::EME_CODEC_MP4_ALL) != 0;
-#endif  // BUILDFLAG(USE_PROPRIETARY_CODECS)
+#endif  // defined(USE_PROPRIETARY_CODECS)
 
   return false;
 }