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

chrome/browser/extensions/api/storage/syncable_settings_storage.h

Index: chrome/browser/extensions/api/storage/syncable_settings_storage.h
diff --git a/chrome/browser/extensions/api/storage/syncable_settings_storage.h b/chrome/browser/extensions/api/storage/syncable_settings_storage.h
index b278aca3030a633c6cdc3df19bc65c369edaa3c7..a5fb15047ce1f15f612afa7829db0d3922b69e69 100644
--- a/chrome/browser/extensions/api/storage/syncable_settings_storage.h
+++ b/chrome/browser/extensions/api/storage/syncable_settings_storage.h
@@ -31,26 +31,25 @@ class SyncableSettingsStorage : public ValueStore {
       syncer::ModelType sync_type,
       const syncer::SyncableService::StartSyncFlare& flare);
 
-  virtual ~SyncableSettingsStorage();
+  ~SyncableSettingsStorage() override;
 
   // ValueStore implementation.
-  virtual size_t GetBytesInUse(const std::string& key) override;
-  virtual size_t GetBytesInUse(const std::vector<std::string>& keys) override;
-  virtual size_t GetBytesInUse() override;
-  virtual ReadResult Get(const std::string& key) override;
-  virtual ReadResult Get(const std::vector<std::string>& keys) override;
-  virtual ReadResult Get() override;
-  virtual WriteResult Set(
-      WriteOptions options,
-      const std::string& key,
-      const base::Value& value) override;
-  virtual WriteResult Set(
-      WriteOptions options, const base::DictionaryValue& values) override;
-  virtual WriteResult Remove(const std::string& key) override;
-  virtual WriteResult Remove(const std::vector<std::string>& keys) override;
-  virtual WriteResult Clear() override;
-  virtual bool Restore() override;
-  virtual bool RestoreKey(const std::string& key) override;
+  size_t GetBytesInUse(const std::string& key) override;
+  size_t GetBytesInUse(const std::vector<std::string>& keys) override;
+  size_t GetBytesInUse() override;
+  ReadResult Get(const std::string& key) override;
+  ReadResult Get(const std::vector<std::string>& keys) override;
+  ReadResult Get() override;
+  WriteResult Set(WriteOptions options,
+                  const std::string& key,
+                  const base::Value& value) override;
+  WriteResult Set(WriteOptions options,
+                  const base::DictionaryValue& values) override;
+  WriteResult Remove(const std::string& key) override;
+  WriteResult Remove(const std::vector<std::string>& keys) override;
+  WriteResult Clear() override;
+  bool Restore() override;
+  bool RestoreKey(const std::string& key) override;
 
   // Sync-related methods, analogous to those on SyncableService (handled by
   // ExtensionSettings), but with looser guarantees about when the methods