Standardize usage of virtual/override/final specifiers.

chrome/common/local_discovery/service_discovery_client_unittest.cc

 // Copyright 2014 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 "base/memory/weak_ptr.h"
 #include "base/run_loop.h"
 #include "chrome/common/local_discovery/service_discovery_client_impl.h"
 #include "net/base/net_errors.h"
 #include "net/dns/dns_protocol.h"
 #include "net/dns/mdns_client_impl.h"
@@ skipping 189 matching lines @@
   }
 };
 
 class ServiceDiscoveryTest : public ::testing::Test {
  public:
   ServiceDiscoveryTest()
       : service_discovery_client_(&mdns_client_) {
     mdns_client_.StartListening(&socket_factory_);
   }
 
-  virtual ~ServiceDiscoveryTest() {
-  }
+  ~ServiceDiscoveryTest() override {}
 
  protected:
   void RunFor(base::TimeDelta time_period) {
     base::CancelableCallback<void()> callback(base::Bind(
         &ServiceDiscoveryTest::Stop, base::Unretained(this)));
     base::MessageLoop::current()->PostDelayedTask(
         FROM_HERE, callback.callback(), time_period);
 
     base::MessageLoop::current()->Run();
     callback.Cancel();
@@ skipping 287 matching lines @@
                          ServiceResolver::STATUS_REQUEST_TIMEOUT, _, _, _));
 
   // TODO(noamsml): When NSEC record support is added, change this to use an
   // NSEC record.
   RunFor(base::TimeDelta::FromSeconds(4));
 };
 
 }  // namespace
 
 }  // namespace local_discovery