Update {virtual,override} to follow C++11 style in components.

components/leveldb_proto/testing/fake_db.h

Index: components/leveldb_proto/testing/fake_db.h
diff --git a/components/leveldb_proto/testing/fake_db.h b/components/leveldb_proto/testing/fake_db.h
index 3bcc70e7b593d592ba75bde14ea6fdfc9c1c4785..2009e1061d79c3d0fdc44a1548756c115b2ac384 100644
--- a/components/leveldb_proto/testing/fake_db.h
+++ b/components/leveldb_proto/testing/fake_db.h
@@ -25,19 +25,17 @@ class FakeDB : public ProtoDatabase<T> {
   typedef typename base::hash_map<std::string, T> EntryMap;
 
   explicit FakeDB(EntryMap* db);
-  virtual ~FakeDB();
+  ~FakeDB() override;
 
-  virtual void Init(const base::FilePath& database_dir,
-                    typename ProtoDatabase<T>::InitCallback callback)
-      override;
+  void Init(const base::FilePath& database_dir,
+            typename ProtoDatabase<T>::InitCallback callback) override;
 
-  virtual void UpdateEntries(
+  void UpdateEntries(
       scoped_ptr<typename ProtoDatabase<T>::KeyEntryVector> entries_to_save,
       scoped_ptr<std::vector<std::string> > keys_to_remove,
       typename ProtoDatabase<T>::UpdateCallback callback) override;
 
-  virtual void LoadEntries(typename ProtoDatabase<T>::LoadCallback callback)
-      override;
+  void LoadEntries(typename ProtoDatabase<T>::LoadCallback callback) override;
   base::FilePath& GetDirectory();
 
   void InitCallback(bool success);