Standardize usage of virtual/override/final in net/

net/quic/quic_connection.cc

Index: net/quic/quic_connection.cc
diff --git a/net/quic/quic_connection.cc b/net/quic/quic_connection.cc
index 72f66dc348f5db70c7ea6ffc4ad4867fec6f8fd8..a0794f33cff6fb959fbfe272d814d3a0fb74e002 100644
--- a/net/quic/quic_connection.cc
+++ b/net/quic/quic_connection.cc
@@ -69,7 +69,7 @@ class AckAlarm : public QuicAlarm::Delegate {
       : connection_(connection) {
   }
 
-  virtual QuicTime OnAlarm() override {
+  QuicTime OnAlarm() override {
     connection_->SendAck();
     return QuicTime::Zero();
   }
@@ -89,7 +89,7 @@ class RetransmissionAlarm : public QuicAlarm::Delegate {
       : connection_(connection) {
   }
 
-  virtual QuicTime OnAlarm() override {
+  QuicTime OnAlarm() override {
     connection_->OnRetransmissionTimeout();
     return QuicTime::Zero();
   }
@@ -108,7 +108,7 @@ class SendAlarm : public QuicAlarm::Delegate {
       : connection_(connection) {
   }
 
-  virtual QuicTime OnAlarm() override {
+  QuicTime OnAlarm() override {
     connection_->WriteIfNotBlocked();
     // Never reschedule the alarm, since CanWrite does that.
     return QuicTime::Zero();
@@ -126,7 +126,7 @@ class TimeoutAlarm : public QuicAlarm::Delegate {
       : connection_(connection) {
   }
 
-  virtual QuicTime OnAlarm() override {
+  QuicTime OnAlarm() override {
     connection_->CheckForTimeout();
     // Never reschedule the alarm, since CheckForTimeout does that.
     return QuicTime::Zero();
@@ -144,7 +144,7 @@ class PingAlarm : public QuicAlarm::Delegate {
       : connection_(connection) {
   }
 
-  virtual QuicTime OnAlarm() override {
+  QuicTime OnAlarm() override {
     connection_->SendPing();
     return QuicTime::Zero();
   }