Changed TestShellWebMimeRegistryImpl to blacklist rather than whitelist containers and codecs.

net/base/mime_util.h

Index: net/base/mime_util.h
diff --git a/net/base/mime_util.h b/net/base/mime_util.h
index adff5181f399b2af4dccb056290f2a8f893dabeb..70228bad633cb483f9165e5ecb897fdab0fc14e8 100644
--- a/net/base/mime_util.h
+++ b/net/base/mime_util.h
@@ -110,6 +110,13 @@ 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 std::vector<std::string> GetProprietaryMediaTypes();

[scherkus (not reviewing), 2012/04/10 21:22:17]

can we pass in a std::vector<std::string> pointer as an out-param?

given how tiny these sets are we don't really need to use a hash_set -- so why
not make blacklisted_media_map_ / blacklisted_codecs_map_ vector<string>s, pass
them in as out-params, then do simple iteration instead of find()?

[ddorwin, 2012/04/11 19:14:20]

Done.

+NET_EXPORT std::vector<std::string> GetProprietaryMediaCodecs();
+
 }  // namespace net
 
 #endif  // NET_BASE_MIME_UTIL_H__