Add a Restore() method to ValueStore and make StorageAPI use it

chrome/browser/extensions/api/storage/leveldb_settings_storage_factory.cc

Index: chrome/browser/extensions/api/storage/leveldb_settings_storage_factory.cc
diff --git a/chrome/browser/extensions/api/storage/leveldb_settings_storage_factory.cc b/chrome/browser/extensions/api/storage/leveldb_settings_storage_factory.cc
index f58ff7c1af89762c011ac23727aa6ca0e1657fd5..ce72e10239d191d2eb215b56fd40113a33772365 100644
--- a/chrome/browser/extensions/api/storage/leveldb_settings_storage_factory.cc
+++ b/chrome/browser/extensions/api/storage/leveldb_settings_storage_factory.cc
@@ -12,7 +12,13 @@ namespace extensions {
 ValueStore* LeveldbSettingsStorageFactory::Create(
     const base::FilePath& base_path,
     const std::string& extension_id) {
-  return new LeveldbValueStore(base_path.AppendASCII(extension_id));
+  return new LeveldbValueStore(GetDatabasePath(base_path, extension_id));
+}
+
+base::FilePath LeveldbSettingsStorageFactory::GetDatabasePath(
+    const base::FilePath& base_path,
+    const std::string& extension_id) {
+  return base_path.AppendASCII(extension_id);
 }
 
 }  // namespace extensions