Generalize migration code in WebDatabase.

chrome/browser/webdata/logins_table.cc

 // Copyright (c) 2012 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 "chrome/browser/webdata/logins_table.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "sql/statement.h"
@@ skipping 23 matching lines @@
     }
   }
 #endif
 
   return true;
 }
 
 bool LoginsTable::IsSyncable() {
   return true;
 }
+
+bool LoginsTable::MigrateToVersion(int version,
+                                   const std::string& app_locale,
+                                   bool* update_compatible_version) {
+  return true;
+}