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Remove cas() method

Authored by aaron.

Description

Remove cas() method

It is not reachable from outside callers and merge()
is not overridden to use cas() so the code is unused.

Follows-up 945f2b3546f4ac which removed support for CAS,
but wrongly concluded that merge still uses it.
BufferedBagOStuff extends HashBagOStuff which uses locks
for merge instead of CAS (per the default behaviour of
BagOStuff::merge).

Change-Id: I24e32a2aad88de9203236a34be7c2b603f3f1e6c

Details