Revert "Reduce number of allocations in AutoStopwatch"

This reverts commit 3476c1d60ec29c5497123194acd7a9310b1023d2.

1 files changed, 2 insertions, 6 deletions

diff --git a/toolkit/components/perfmonitoring/nsPerformanceStats.cpp b/toolkit/components/perfmonitoring/nsPerformanceStats.cpp
index 03e63a461..6c470356a 100644
--- a/toolkit/components/perfmonitoring/nsPerformanceStats.cpp
+++ b/toolkit/components/perfmonitoring/nsPerformanceStats.cpp
@@ -1310,12 +1310,8 @@ nsPerformanceStatsService::GetResources(uint64_t* userTime,
 
 void
 nsPerformanceStatsService::NotifyJankObservers(const mozilla::Vector<uint64_t>& aPreviousJankLevels) {
-
-  // The move operation is generally constant time, unless `mPendingAlerts.length()` is very small, in which case it's
-  // fast anyway.
-  GroupVector alerts(Move(mPendingAlerts));
-  mPendingAlerts = GroupVector(); // Reconstruct after `Move`.
-
+  GroupVector alerts;
+  mPendingAlerts.swap(alerts);
   if (!mPendingAlertsCollector) {
     // We are shutting down.
     return;