Bug 1827684 - Allow audio/aac. r=sefeng,necko-reviewers

It's possible for a streaming server to not start at an ADTS header
sync marker. We need a sliding window sniffer to be able to handle
this, until then we'll include audio/aac in the gradual ORB
transition.

Differential Revision: https://phabricator.services.mozilla.com/D178177

netwerk/protocol/http/OpaqueResponseUtils.cpp

@@ -55,7 +55,8 @@ static bool IsOpaqueSafeListedSpecBreakingMIMEType(
   // This is not a good solution, but we need this until we solve Bug 1827684 in
   // a better way. Chromium currently allows all "audio/*" and "video/*", but
   // from discussion in bug, we want to try only "audio/mpeg".
-  if (StringBeginsWith(aContentType, "audio/mpeg"_ns)) {
+  if (aContentType.EqualsLiteral(AUDIO_MP3) ||
+      aContentType.EqualsLiteral(AUDIO_AAC)) {
     return true;
   }