Revert "Source SDK 2013 update 1"

This reverts commit ddf66d8241c4bb5981c65ad08a7ee73496d5ed8a.
Revert "Revert "Source SDK 2013 update 1""

This reverts commit ac2106d0f8bd1d6556dbe99f8be050bccda9025f.
Nothing done.

In the end this commit did nothing.