Consolidate MPEG*_AAC_* MimeUtil::Codec enum values

media/base/mime_util_internal.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_MIME_UTIL_INTERNAL_H_
 #define MEDIA_BASE_MIME_UTIL_INTERNAL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 12 matching lines @@
  public:
   MimeUtil();
   ~MimeUtil();
 
   enum Codec {
     INVALID_CODEC,
     PCM,
     MP3,
     AC3,
     EAC3,
-    MPEG2_AAC_LC,
-    MPEG2_AAC_MAIN,
-    MPEG2_AAC_SSR,
-    MPEG4_AAC_LC,
-    MPEG4_AAC_SBR_v1,
-    MPEG4_AAC_SBR_PS_v2,
+    MPEG2_AAC,
+    MPEG4_AAC,
     VORBIS,
     OPUS,
     H264,
     HEVC_MAIN,
     VP8,
     VP9,
     THEORA,
     LAST_CODEC = THEORA
   };
 
@@ skipping 106 matching lines @@
   // Lookup table for string compare based string -> Codec mappings.
   StringToCodecMappings string_to_codec_map_;
 
   DISALLOW_COPY_AND_ASSIGN(MimeUtil);
 };
 
 }  // namespace internal
 }  // namespace media
 
 #endif  // MEDIA_BASE_MIME_UTIL_INTERNAL_H_