
Put Mutex in the same namespace as the other template code.  I don't see
a good reason not to, and it's making it hard to
forward-declare Mutex otherwise.

Note that with this change, Mutex is not available from the
global namespace (which it was before due to the using
statement), which I think is a good thing.

R=ribrdb
DELTA=16  (1 added, 9 deleted, 6 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=2767


git-svn-id: 7430060e6841a9654fb88af138dc49f4cb61350d@74 cb39b542-eb2e-2a05-867b-f1791dd5f601

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