Revert "Mark test_sb_api_listener_event_process_state as flakey"

This reverts commit a4f5f4da7e164b7ac358a75f2e4254c25718ad4b.
This test fails 100% with gcc4.9.2, revert it first. Will find out why xfail is overruled by xflaky.

llvm-svn: 241014