trial_registered_  130 base/metrics/field_trial.cc   if (trial_registered_)
trial_registered_  193 base/metrics/field_trial.cc   DCHECK(!trial_registered_);
trial_registered_  194 base/metrics/field_trial.cc   trial_registered_ = true;
trial_registered_  278 base/metrics/field_trial.h   bool trial_registered_;