The following files reference the long-ago removed NetworkInterfaceASIO class (https://jira.mongodb.org/browse/SERVER-34730):

• free_mon_controller_test.cpp
• free_mon_queue_test.cpp
• sharding_mongod_test_fixture.cpp
• network_interface_perf_test.cpp
• network_interface_thread_pool_test.cpp

Comments need to be updated to reflect the truth. 

References to the actual class shouldn't be able to compile, which means they aren't actually being compiled. These files should be removed or re-enabled.