Generalize migration code in WebDatabase.

chrome/browser/webdata/web_apps_table.h

 // Copyright (c) 2011 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_APPS_TABLE_H_
 #define CHROME_BROWSER_WEBDATA_WEB_APPS_TABLE_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 17 matching lines @@
 //   height      Height of the image.
 //   image       PNG encoded image data.
 //
 class WebAppsTable : public WebDatabaseTable {
  public:
   WebAppsTable(sql::Connection* db, sql::MetaTable* meta_table)
       : WebDatabaseTable(db, meta_table) {}
   virtual ~WebAppsTable() {}
   virtual bool Init() OVERRIDE;
   virtual bool IsSyncable() OVERRIDE;
+  virtual bool MigrateToVersion(int version,
+                                const std::string& app_locale,
+                                bool* update_compatible_version) OVERRIDE;
 
   bool SetWebAppImage(const GURL& url, const SkBitmap& image);
 
   // Returns true if all images are retrieved. Returns false if there is a
   // database error. In this case, the state of images is undefined; it may have
   // partial results or no results from the call.
   bool GetWebAppImages(const GURL& url, std::vector<SkBitmap>* images);
 
   bool SetWebAppHasAllImages(const GURL& url, bool has_all_images);
   bool GetWebAppHasAllImages(const GURL& url);
 
   bool RemoveWebApp(const GURL& url);
 
  private:
   bool InitWebAppIconsTable();
   bool InitWebAppsTable();
 
   DISALLOW_COPY_AND_ASSIGN(WebAppsTable);
 };
 
 #endif  // CHROME_BROWSER_WEBDATA_WEB_APPS_TABLE_H_