Delete and try to recreate localstorage database on invalid schema version.

components/leveldb/public/interfaces/leveldb.mojom

Index: components/leveldb/public/interfaces/leveldb.mojom
diff --git a/components/leveldb/public/interfaces/leveldb.mojom b/components/leveldb/public/interfaces/leveldb.mojom
index cf62f675f90266d1c6bd92c97ccd0a2ae41ff258..7ea8dfe5e396aea4f3fb99584ce17847ec781a75 100644
--- a/components/leveldb/public/interfaces/leveldb.mojom
+++ b/components/leveldb/public/interfaces/leveldb.mojom
@@ -71,6 +71,9 @@ interface LevelDBService {
                   LevelDBDatabase& database) => (DatabaseError status);
 
   OpenInMemory(LevelDBDatabase& database) => (DatabaseError status);
+
+  Destroy(filesystem.mojom.Directory directory,
+       string dbname) => (DatabaseError status);

[jam, 2017/01/12 17:24:42]

nit: indentation

also please add documentation to this method. we should have had some on the few
before but maybe skipped because it seemed obvious. 

[Marijn Kruisselbrink, 2017/01/13 19:25:11]

Fixed, also added (minimal) documentation to the various Open methods.

 };
 
 // A leveldb database.