Update {virtual,override,final} to follow C++11 style in net, round 2.

net/proxy/proxy_service.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/proxy/proxy_service.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 283 matching lines @@
     NetLog::LogLevel /* log_level */) {
   base::DictionaryValue* dict = new base::DictionaryValue();
   dict->SetString("pac_string", result->ToPacString());
   return dict;
 }
 
 #if defined(OS_CHROMEOS)
 class UnsetProxyConfigService : public ProxyConfigService {
  public:
   UnsetProxyConfigService() {}
-  virtual ~UnsetProxyConfigService() {}
+  ~UnsetProxyConfigService() override {}
 
-  virtual void AddObserver(Observer* observer) override {}
-  virtual void RemoveObserver(Observer* observer) override {}
-  virtual ConfigAvailability GetLatestProxyConfig(
-      ProxyConfig* config) override {
+  void AddObserver(Observer* observer) override {}
+  void RemoveObserver(Observer* observer) override {}
+  ConfigAvailability GetLatestProxyConfig(ProxyConfig* config) override {
     return CONFIG_UNSET;
   }
 };
 #endif
 
 }  // namespace
 
 // ProxyService::InitProxyResolver --------------------------------------------
 
 // This glues together two asynchronous steps:
@@ skipping 1261 matching lines @@
   State previous_state = ResetProxyConfig(false);
   if (previous_state != STATE_NONE)
     ApplyProxyConfigIfAvailable();
 }
 
 void ProxyService::OnDNSChanged() {
   OnIPAddressChanged();
 }
 
 }  // namespace net