Standardize usage of virtual/override/final in net/

net/disk_cache/blockfile/backend_impl_v3.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/disk_cache/blockfile/backend_impl_v3.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 1492 matching lines @@
 }
 
 int BackendImplV3::DoomEntriesSince(base::Time initial_time,
                                     const CompletionCallback& callback) {
   return net::ERR_FAILED;
 }
 
 
 class BackendImplV3::NotImplementedIterator : public Backend::Iterator {
  public:
-  virtual int OpenNextEntry(disk_cache::Entry** next_entry,
-                            const net::CompletionCallback& callback) override {
+  int OpenNextEntry(disk_cache::Entry** next_entry,
+                    const net::CompletionCallback& callback) override {
     return net::ERR_NOT_IMPLEMENTED;
   }
 };
 
 scoped_ptr<Backend::Iterator> BackendImplV3::CreateIterator() {
   return scoped_ptr<Iterator>(new NotImplementedIterator());
 }
 
 void BackendImplV3::GetStats(StatsItems* stats) {
   NOTIMPLEMENTED();
 }
 
 void BackendImplV3::OnExternalCacheHit(const std::string& key) {
   NOTIMPLEMENTED();
 }
 
 void BackendImplV3::CleanupCache() {
 }
 
 }  // namespace disk_cache