Add support to mime types in Files app UI.

ui/file_manager/audio_player/manifest.json

 {
   // chrome-extension://cjbfomnbifhcdnihkgipgfcihmgjfhbf/
   "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsU2jLo1oiASjXO+/+qYfgojW4Y5TCIBNFzcAdxaF78BRteygWkJqbUVyGZxtSk/RDe3NdNyQCxsyU1YfYXZQvGRNDwKw5tzGyE4dcedveipaJW174VGd3GViS0WWist3HRxfYRZvRP5E8l/4NxXB0+crfq2WolO8La25js1QkCsggQ1lC8g24NRrPnTAWZxvSD6L64R0UoVoe68HdC4mRISe9/OqjyiAfb4Ajgooq8dyzkV8AJTKRjFTmYPlcc5Ba21rXzRt22TnDh2U38m/OEvTu69cyTIxAkBjUa/2gu7N588k9XzaMhTjiolSWxBDQuLZRp8fNjO0R27jouo3FwIDAQAB",
   "manifest_version": 2,
   "name": "Audio Player",
   "version": "1.0",
   "description": "Audio Player",
   "display_in_launcher": false,
   "incognito" : "split",
   "icons": {
@@ skipping 14 matching lines @@
     },
     "fullscreen",
     "mediaPlayerPrivate",
     "power",
     "storage",
     "chrome://resources/",
     "chrome://theme/"
   ],
   "file_handlers": {
     "audio": {
-      "types": [
-        "audio/*"
-      ],
       "extensions": [
         "amr",
         "flac",
         "m4a",
         "mp3",
         "oga",
         "ogg",
         "wav"
       ]
     }
@@ skipping 17 matching lines @@
         "chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj/background/js/test_util_base.js",
         "chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj/background/js/volume_manager.js",
         "js/error_util.js",
         // The main background script must be at the end.
         "js/background.js"
       ]
     },
     "content_security_policy": "default-src 'none'; script-src 'self' chrome://resources chrome-extension://boadgeojelhgndaghljhdicfkmllpafd chrome-extension://dliochdbjfkdbacpmhlcpmleaejidimm chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj chrome-extension://fmfcbgogabcbclcofgocippekhfcmgfj chrome-extension://enhhojjnijigcajfphajepfemndkmdlo; style-src 'self' chrome://resources 'unsafe-inline'; img-src 'self' chrome://theme chrome://resources data: https://www.googledrive.com; media-src 'self'; object-src 'self'"
   }
 }