Replace the Persistent in SQLiteDatabase with a member and trace it.

Source/modules/webdatabase/sqlite/SQLiteDatabase.cpp

Index: Source/modules/webdatabase/sqlite/SQLiteDatabase.cpp
diff --git a/Source/modules/webdatabase/sqlite/SQLiteDatabase.cpp b/Source/modules/webdatabase/sqlite/SQLiteDatabase.cpp
index 86b64733dfdfa833169e6b6a502919b1cd09b2e5..4f1caacdc97b88c04e02ebe660e6e832e34571de 100644
--- a/Source/modules/webdatabase/sqlite/SQLiteDatabase.cpp
+++ b/Source/modules/webdatabase/sqlite/SQLiteDatabase.cpp
@@ -421,4 +421,9 @@ bool SQLiteDatabase::turnOnIncrementalAutoVacuum()
     }
 }
 
+void SQLiteDatabase::trace(Visitor* visitor)
+{
+    visitor->trace(m_authorizer);
+}
+
 } // namespace WebCore