Standardize usage of virtual/override/final specifiers.

net/base/dns_reloader.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/base/dns_reloader.h"
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_OPENBSD) && \
     !defined(OS_ANDROID)
 
 #include <resolv.h>
@@ skipping 28 matching lines @@
 // Android does not have /etc/resolv.conf. The system takes care of nameserver
 // changes, so none of this is needed.
 
 class DnsReloader : public net::NetworkChangeNotifier::DNSObserver {
  public:
   struct ReloadState {
     int resolver_generation;
   };
 
   // NetworkChangeNotifier::DNSObserver:
-  virtual void OnDNSChanged() override {
+  void OnDNSChanged() override {
     DCHECK(base::MessageLoopForIO::IsCurrent());
     base::AutoLock l(lock_);
     resolver_generation_++;
   }
 
   void MaybeReload() {
     ReloadState* reload_state = static_cast<ReloadState*>(tls_index_.Get());
     base::AutoLock l(lock_);
 
     if (!reload_state) {
@@ skipping 17 matching lines @@
       res_nclose(&_res);
     delete reload_state;
   }
 
  private:
   DnsReloader() : resolver_generation_(0) {
     tls_index_.Initialize(SlotReturnFunction);
     net::NetworkChangeNotifier::AddDNSObserver(this);
   }
 
-  virtual ~DnsReloader() {
+  ~DnsReloader() override {
     NOTREACHED();  // LeakyLazyInstance is not destructed.
   }
 
   base::Lock lock_;  // Protects resolver_generation_.
   int resolver_generation_;
   friend struct base::DefaultLazyInstanceTraits<DnsReloader>;
 
   // We use thread local storage to identify which ReloadState to interact with.
   static base::ThreadLocalStorage::StaticSlot tls_index_;
 
@@ skipping 18 matching lines @@
 void DnsReloaderMaybeReload() {
   // This routine can be called by any of the DNS worker threads.
   DnsReloader* dns_reloader = g_dns_reloader.Pointer();
   dns_reloader->MaybeReload();
 }
 
 }  // namespace net
 
 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_OPENBSD) &&
         // !defined(OS_ANDROID)