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

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

Index: chrome/browser/extensions/api/storage/settings_test_util.cc
diff --git a/chrome/browser/extensions/api/storage/settings_test_util.cc b/chrome/browser/extensions/api/storage/settings_test_util.cc
index 262a3e181c980bf7840fe1225370b917993c3470..96843faf911b7eb8d29de8c2f50a35016f136a94 100644
--- a/chrome/browser/extensions/api/storage/settings_test_util.cc
+++ b/chrome/browser/extensions/api/storage/settings_test_util.cc
@@ -162,6 +162,12 @@ ValueStore* ScopedSettingsStorageFactory::Create(
   return delegate_->Create(base_path, extension_id);
 }
 
+void ScopedSettingsStorageFactory::DeleteDatabaseIfExists(
+    const base::FilePath& base_path,
+    const std::string& extension_id) {
+  delegate_->DeleteDatabaseIfExists(base_path, extension_id);
+}
+
 }  // namespace settings_test_util
 
 }  // namespace extensions