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

components/leveldb/leveldb_service_impl.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/leveldb/leveldb_service_impl.h"
 
 #include <memory>
 
 #include "base/memory/ptr_util.h"
 #include "components/leveldb/env_mojo.h"
@@ skipping 74 matching lines @@
 
   if (s.ok()) {
     mojo::MakeStrongBinding(base::MakeUnique<LevelDBDatabaseImpl>(
                                 std::move(env), base::WrapUnique(db)),
                             std::move(database));
   }
 
   callback.Run(LeveldbStatusToError(s));
 }
 
+void LevelDBServiceImpl::Destroy(filesystem::mojom::DirectoryPtr directory,
+                                 const std::string& dbname,
+                                 const DestroyCallback& callback) {
+  leveldb::Options options;
+  // Register our directory with the file thread.
+  LevelDBMojoProxy::OpaqueDir* dir =
+      thread_->RegisterDirectory(std::move(directory));
+  std::unique_ptr<MojoEnv> env_mojo(new MojoEnv(thread_, dir));
+  options.env = env_mojo.get();
+  callback.Run(LeveldbStatusToError(leveldb::DestroyDB(dbname, options)));
+}
+
 }  // namespace leveldb