Make AAC-w/o-description WPT a mozilla-specific WPT

Due to the ongoing discussion in issue 832 [1], which has not yet
reached a consensus among all parties, the AAC-without-description WPT
introduced in the previous patch should be relocated to the *mozilla*
folder under WPT. This ensures that the test remains specific to Mozilla
and avoids unintentionally causing failures in other browers' test
suites.

[1] w3c/webcodecs#832

Differential Revision: https://phabricator.services.mozilla.com/D222712

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1917721
gecko-commit: c81481c06eac3165b72e7bb2c3040a48b3994a0a
gecko-reviewers: media-playback-reviewers, padenot

webcodecs/audioDecoder-codec-specific.https.any.js

@@ -2,7 +2,6 @@
 // META: script=/webcodecs/utils.js
 // META: variant=?adts_aac
 // META: variant=?mp4_aac
-// META: variant=?mp4_raw_aac_no_desc
 // META: variant=?mp3
 // META: variant=?opus
 // META: variant=?pcm_alaw
@@ -71,30 +70,6 @@ const MP4_AAC_DATA = {
   duration: 21333
 };
 
-// By spec, if the description is absent, the bitstream defaults to ADTS format.
-// However, this is added to ensure compatibility and handle potential misuse cases.
-const MP4_AAC_DATA_NO_DESCRIPTION = {
-  src: 'sfx-aac.mp4',
-  config: {
-    codec: 'mp4a.40.2',
-    sampleRate: 48000,
-    numberOfChannels: 1,
-  },
-  chunks: [
-    {offset: 44, size: 241},
-    {offset: 285, size: 273},
-    {offset: 558, size: 251},
-    {offset: 809, size: 118},
-    {offset: 927, size: 223},
-    {offset: 1150, size: 141},
-    {offset: 1291, size: 217},
-    {offset: 1508, size: 159},
-    {offset: 1667, size: 209},
-    {offset: 1876, size: 176},
-  ],
-  duration: 21333
-};
-
 const OPUS_DATA = {
   src: 'sfx-opus.ogg',
   config: {
@@ -187,7 +162,6 @@ promise_setup(async () => {
     '?adts_aac': ADTS_AAC_DATA,
     '?mp3': MP3_DATA,
     '?mp4_aac': MP4_AAC_DATA,
-    '?mp4_raw_aac_no_desc': MP4_AAC_DATA_NO_DESCRIPTION,
     '?opus': OPUS_DATA,
     '?pcm_alaw': PCM_ALAW_DATA,
     '?pcm_ulaw': PCM_ULAW_DATA,