Standardize usage of virtual/override/final specifiers.

net/tools/quic/quic_epoll_connection_helper_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/quic/quic_epoll_connection_helper.h"
 
 #include "net/quic/crypto/quic_random.h"
 #include "net/tools/quic/test_tools/mock_epoll_server.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using net::tools::test::MockEpollServer;
 
 namespace net {
 namespace tools {
 namespace test {
 namespace {
 
 class TestDelegate : public QuicAlarm::Delegate {
  public:
   TestDelegate() : fired_(false) {}
 
-  virtual QuicTime OnAlarm() override {
+  QuicTime OnAlarm() override {
     fired_ = true;
     return QuicTime::Zero();
   }
 
   bool fired() const { return fired_; }
 
  private:
   bool fired_;
 };
 
@@ skipping 103 matching lines @@
 
   // Update it with an uninitialized time and ensure it's cancelled.
   alarm->Update(QuicTime::Zero(), QuicTime::Delta::FromMicroseconds(1));
   EXPECT_FALSE(alarm->IsSet());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace tools
 }  // namespace net