Generalize migration code in WebDatabase.

chrome/browser/webdata/web_intents_table.h

 // 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.
 
 #ifndef CHROME_BROWSER_WEBDATA_WEB_INTENTS_TABLE_H_
 #define CHROME_BROWSER_WEBDATA_WEB_INTENTS_TABLE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 38 matching lines @@
 // The defaults are scoped by action, then type, then url prefix.
 //
 class WebIntentsTable : public WebDatabaseTable {
  public:
   WebIntentsTable(sql::Connection* db, sql::MetaTable* meta_table);
   virtual ~WebIntentsTable();
 
   // WebDatabaseTable implementation.
   virtual bool Init() OVERRIDE;
   virtual bool IsSyncable() OVERRIDE;
+  virtual bool MigrateToVersion(int version,
+                                const std::string& app_locale,
+                                bool* update_compatible_version) OVERRIDE;
 
   // Adds "scheme" column to the web_intents and web_intents_defaults tables.
   bool MigrateToVersion46AddSchemeColumn();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebIntentsTable);
 };
 
 #endif  // CHROME_BROWSER_WEBDATA_WEB_INTENTS_TABLE_H_