Changed TestShellWebMimeRegistryImpl to blacklist rather than whitelist containers and codecs.

net/base/mime_util.h

 // Copyright (c) 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 NET_BASE_MIME_UTIL_H__
 #define NET_BASE_MIME_UTIL_H__
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 92 matching lines @@
 
 // Get the extensions associated with the given mime type.
 // There could be multiple extensions for a given mime type, like "html,htm"
 // for "text/html".
 // Note that we do not erase the existing elements in the the provided vector.
 // Instead, we append the result to it.
 NET_EXPORT void GetExtensionsForMimeType(
     const std::string& mime_type,
     std::vector<FilePath::StringType>* extensions);
 
+// Test only methods that return lists of proprietary media types and codecs
+// that are not supported by all variations of Chromium.
+// These types and codecs must be blacklisted to ensure consistent layout test
+// results across all Chromium variations.
+NET_EXPORT void GetMediaTypesBlacklistedForTests(
+    std::vector<std::string>* types);
+NET_EXPORT void GetMediaCodecsBlacklistedForTests(
+    std::vector<std::string>* codecs);
+
 }  // namespace net
 
 #endif  // NET_BASE_MIME_UTIL_H__