Fix localstorage data migration.

content/browser/dom_storage/local_storage_context_mojo.h

 // 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.
 
 #ifndef CONTENT_BROWSER_DOM_STORAGE_LOCAL_STORAGE_CONTEXT_MOJO_H_
 #define CONTENT_BROWSER_DOM_STORAGE_LOCAL_STORAGE_CONTEXT_MOJO_H_
 
 #include <memory>
 
 #include "base/files/file_path.h"
@@ skipping 33 matching lines @@
   // Like DeleteStorage(), but also deletes storage for all sub-origins.
   void DeleteStorageForPhysicalOrigin(const url::Origin& origin);
   void Flush();
 
   // Clears any caches, to free up as much memory as possible. Next access to
   // storage for a particular origin will reload the data from the database.
   void PurgeMemory();
 
   leveldb::mojom::LevelDBDatabaseAssociatedRequest DatabaseRequestForTesting();
 
+  // Converts a string from the old storage format to the new storage format.
+  static std::vector<uint8_t> MigrateString(const base::string16& input);
+
  private:
   friend class MojoDOMStorageBrowserTest;
 
   class LevelDBWrapperHolder;
 
   // Runs |callback| immediately if already connected to a database, otherwise
   // delays running |callback| untill after a connection has been established.
   // Initiates connecting to the database if no connection is in progres yet.
   void RunWhenConnected(base::OnceClosure callback);
 
@@ skipping 56 matching lines @@
   // Used to access old data for migration.
   scoped_refptr<DOMStorageTaskRunner> task_runner_;
   base::FilePath old_localstorage_path_;
 
   base::WeakPtrFactory<LocalStorageContextMojo> weak_ptr_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_LOCAL_STORAGE_CONTEXT_MOJO_H_