avc1_extended_codec  472 chrome/browser/media/encrypted_media_istypesupported_browsertest.cc       "video/mp4", avc1_extended_codec(), kPrefixedClearKey));
avc1_extended_codec  648 chrome/browser/media/encrypted_media_istypesupported_browsertest.cc       "video/mp4", avc1_extended_codec(), kExternalClearKey));
avc1_extended_codec  843 chrome/browser/media/encrypted_media_istypesupported_browsertest.cc       "video/mp4", avc1_extended_codec(), kWidevineAlpha));