Use overloaded operators with QuicTime for addition, subtraction and scalar

net/tools/quic/quic_time_wait_list_manager.cc

Index: net/tools/quic/quic_time_wait_list_manager.cc
diff --git a/net/tools/quic/quic_time_wait_list_manager.cc b/net/tools/quic/quic_time_wait_list_manager.cc
index 6686238a03cf7859e8372befdaca945dc9536e8e..ffe3dd4df00925c5c789d0e85f72850e73828440 100644
--- a/net/tools/quic/quic_time_wait_list_manager.cc
+++ b/net/tools/quic/quic_time_wait_list_manager.cc
@@ -267,9 +267,8 @@ void QuicTimeWaitListManager::SetConnectionIdCleanUpAlarm() {
     QuicTime oldest_connection_id =
         connection_id_map_.begin()->second.time_added;
     QuicTime now = clock_->ApproximateNow();
-    if (now.Subtract(oldest_connection_id) < time_wait_period_) {
-      next_alarm_interval =
-          oldest_connection_id.Add(time_wait_period_).Subtract(now);
+    if (now - oldest_connection_id < time_wait_period_) {
+      next_alarm_interval = oldest_connection_id + time_wait_period_ - now;
     } else {
       LOG(ERROR) << "ConnectionId lingered for longer than time_wait_period_";
     }
@@ -278,8 +277,8 @@ void QuicTimeWaitListManager::SetConnectionIdCleanUpAlarm() {
     next_alarm_interval = time_wait_period_;
   }
 
-  connection_id_clean_up_alarm_->Set(
-      clock_->ApproximateNow().Add(next_alarm_interval));
+  connection_id_clean_up_alarm_->Set(clock_->ApproximateNow() +
+                                     next_alarm_interval);
 }
 
 bool QuicTimeWaitListManager::MaybeExpireOldestConnection(
@@ -300,7 +299,7 @@ bool QuicTimeWaitListManager::MaybeExpireOldestConnection(
 
 void QuicTimeWaitListManager::CleanUpOldConnectionIds() {
   QuicTime now = clock_->ApproximateNow();
-  QuicTime expiration = now.Subtract(time_wait_period_);
+  QuicTime expiration = now - time_wait_period_;
 
   while (MaybeExpireOldestConnection(expiration)) {
   }