Way to restore schema?

You cannot remove these schema extensions completly without restoring the forest which might be a bit overhead for the situation. Steps are outlined here:

http://technet.microsoft.com/en-us/library/cc786327%28WS.10%29.aspx

However You can defunct these schema extensions:

http://technet.microsoft.com/en-us/library/cc784875%28WS.10%29.aspx

http://technet.microsoft.com/en-us/library/cc961741.aspx

Which I think will saisfy the requirement.

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Tomek Onyszko

http://blogs.dirteam.com/blogs/tomek/ (EN)

http://www.w2k.pl (PL)

Hindsight is 20/20- As with other changes, Schema changes will replicate to all DCs unless you do what Joe Richards suggests, according to him a leading practice now is to put the schema master temporarily in a lag site and make it replicate only after 6 days. This contradicts with the old practice of disconnecting the schema master, making your changes and and bringing it back online if you are content.

I would choose to defunct the schema extensions, over going thru the pain of forest restoration.