Standardize usage of virtual/override/final in chrome/

chrome/utility/importer/safari_importer.h

Index: chrome/utility/importer/safari_importer.h
diff --git a/chrome/utility/importer/safari_importer.h b/chrome/utility/importer/safari_importer.h
index c8ecdf228c5f190bd3bb39d9964a1a36be6dbdcd..9fbbe0b72361a0588fe62f840295ca11e19f4702 100644
--- a/chrome/utility/importer/safari_importer.h
+++ b/chrome/utility/importer/safari_importer.h
@@ -40,9 +40,9 @@ class SafariImporter : public Importer {
   explicit SafariImporter(const base::FilePath& library_dir);
 
   // Importer:
-  virtual void StartImport(const importer::SourceProfile& source_profile,
-                           uint16 items,
-                           ImporterBridge* bridge) override;
+  void StartImport(const importer::SourceProfile& source_profile,
+                   uint16 items,
+                   ImporterBridge* bridge) override;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(SafariImporterTest, BookmarkImport);
@@ -51,7 +51,7 @@ class SafariImporter : public Importer {
   FRIEND_TEST_ALL_PREFIXES(SafariImporterTest, FaviconImport);
   FRIEND_TEST_ALL_PREFIXES(SafariImporterTest, HistoryImport);
 
-  virtual ~SafariImporter();
+  ~SafariImporter() override;
 
   // Multiple URLs can share the same favicon; this is a map
   // of URLs -> IconIDs that we load as a temporary step before