Say we support mime-type audio/mpeg and video/mpeg...

net/base/mime_util.cc

 // Copyright (c) 2006-2009 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.
 
 #include <string>
 
 #include "net/base/mime_util.h"
 #include "net/base/platform_mime_util.h"
 
 #include "base/hash_tables.h"
@@ skipping 170 matching lines @@
   "video/mp4",
   "video/x-m4v",
 
   // MP3.
   // TODO(hclam): may add "audio/mpeg" and "audio/x-mp3".
   "audio/mp3",
 
   // AAC.
   "audio/aac",
   "audio/x-aac"
+
+  // Generic MPEG mime-types.
+  "audio/mpeg",
+  "video/mpeg"
 };
 
 // Note: does not include javascript types list (see supported_javascript_types)
 static const char* const supported_non_image_types[] = {
   "text/html",
   "text/xml",
   "text/xsl",
   "text/plain",
   // Many users complained about css files served for
   // download instead of displaying in the browser:
@@ skipping 174 matching lines @@
 bool IsSupportedMimeType(const std::string& mime_type) {
   return GetMimeUtil()->IsSupportedMimeType(mime_type);
 }
 
 bool MatchesMimeType(const std::string &mime_type_pattern,
                      const std::string &mime_type) {
   return GetMimeUtil()->MatchesMimeType(mime_type_pattern, mime_type);
 }
 
 }  // namespace net