Standardize usage of virtual/override/final in ui/

ui/app_list/search/dictionary_data_store.h

Index: ui/app_list/search/dictionary_data_store.h
diff --git a/ui/app_list/search/dictionary_data_store.h b/ui/app_list/search/dictionary_data_store.h
index 6ebe1bf5afb68f5fd863df178208c166231128e4..1a882c13ac37fd9c15ae2d12a3b4644f94f58a89 100644
--- a/ui/app_list/search/dictionary_data_store.h
+++ b/ui/app_list/search/dictionary_data_store.h
@@ -54,13 +54,13 @@ class APP_LIST_EXPORT DictionaryDataStore
  private:
   friend class base::RefCountedThreadSafe<DictionaryDataStore>;
 
-  virtual ~DictionaryDataStore();
+  ~DictionaryDataStore() override;
 
   // Reads data from backing file.
   scoped_ptr<base::DictionaryValue> LoadOnBlockingPool();
 
   // ImportantFileWriter::DataSerializer overrides:
-  virtual bool SerializeData(std::string* data) override;
+  bool SerializeData(std::string* data) override;
 
   base::FilePath data_file_;
   scoped_refptr<base::SequencedTaskRunner> file_task_runner_;