This eliminates a lifecycle error which caused an instance
of ImplIntrospectionAdapter to be created on every failing
call to ImplIntrospectionAccess::queryAdapter(), rather than
only once, due to an incorrectly conceived weak reference
relationship between the two.

Change-Id: If0c7c906acadfd7f81a0ce9e7f7a949154494720
Reviewed-on: https://gerrit.libreoffice.org/16972Reviewed-by: Matthew Francis <mjay.francis@gmail.com>
Tested-by: Matthew Francis <mjay.francis@gmail.com>