histogram_flattener.h   14 base/metrics/histogram_delta_serialization.h #include "base/metrics/histogram_flattener.h"
histogram_flattener.h    8 base/metrics/histogram_snapshot_manager.cc #include "base/metrics/histogram_flattener.h"
histogram_flattener.h   10 chrome/common/metrics/metrics_service_base.h #include "base/metrics/histogram_flattener.h"