--- a/dom/media/webspeech/recognition/energy_endpointer.cc
+++ b/dom/media/webspeech/recognition/energy_endpointer.cc
@@ -110,17 +110,17 @@ void EnergyEndpointer::HistoryRing::Inse
 int64_t EnergyEndpointer::HistoryRing::EndTime() const {
   int ind = insertion_index_ - 1;
   if (ind < 0)
     ind = decision_points_.size() - 1;
   return decision_points_[ind].time_us;
 }
 
 float EnergyEndpointer::HistoryRing::RingSum(float duration_sec) {
-  if (!decision_points_.size())
+  if (decision_points_.empty())
     return 0.0;
 
   int64_t sum_us = 0;
   int ind = insertion_index_ - 1;
   if (ind < 0)
     ind = decision_points_.size() - 1;
   int64_t end_us = decision_points_[ind].time_us;
   bool is_on = decision_points_[ind].decision;