trace_processor: Fix sched_tracker_unittest.cc
trace_processor: Fix sched_tracker_unittest.cc

TBR: e9b04886ef604b89ec1f7c6dafa5a9a6f31d533e@google.com
Change-Id: I08aecba1005b0f628a0bc1e284cc4a4883410939

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto