Standardize usage of virtual/override/final in chrome/browser/extensions/

chrome/browser/extensions/extension_storage_monitor.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 "chrome/browser/extensions/extension_storage_monitor.h"
 
 #include <map>
 
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 197 matching lines @@
     // If |next_threshold| is -1, it signifies that we should not enforce (and
     // only track) storage for this extension.
     int64 next_threshold;
 
     bool should_uma;
 
     StorageState() : next_threshold(-1), should_uma(false) {}
   };
   typedef std::map<GURL, StorageState> OriginStorageStateMap;
 
-  virtual ~StorageEventObserver() {
+  ~StorageEventObserver() override {
     DCHECK(origin_state_map_.empty());
     StopObserving();
   }
 
   // storage::StorageObserver implementation.
-  virtual void OnStorageEvent(const Event& event) override {
+  void OnStorageEvent(const Event& event) override {
     OriginStorageStateMap::iterator iter =
         origin_state_map_.find(event.filter.origin);
     if (iter == origin_state_map_.end())
       return;
     StorageState& state = iter->second;
 
     if (state.should_uma) {
       if (event.filter.storage_type == storage::kStorageTypePersistent) {
         UMA_HISTOGRAM_MEMORY_KB(
             "Extensions.HostedAppUnlimitedStoragePersistentStorageUsage",
@@ skipping 443 matching lines @@
 void ExtensionStorageMonitor::SetStorageNotificationEnabled(
     const std::string& extension_id,
     bool enable_notifications) {
   extension_prefs_->UpdateExtensionPref(
       extension_id,
       kPrefDisableStorageNotifications,
       enable_notifications ? NULL : new base::FundamentalValue(true));
 }
 
 }  // namespace extensions