BUG-893: do not store classPool

This prevents storing a reference to the classPool. It is not necessary
and it makes thinking about accesses much easier.

Change-Id: Iebbdac46c3ca445bbe36ba6efd19d3150d728f7f
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "BUG-893: do not store classPool"