Generalize migration code in WebDatabase.

chrome/browser/webdata/keyword_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_KEYWORD_TABLE_H_
 #define CHROME_BROWSER_WEBDATA_KEYWORD_TABLE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 57 matching lines @@
   typedef std::vector<TemplateURLData> Keywords;
 
   // Constants exposed for the benefit of test code:
 
   static const char kDefaultSearchProviderKey[];
 
   KeywordTable(sql::Connection* db, sql::MetaTable* meta_table);
   virtual ~KeywordTable();
   virtual bool Init() OVERRIDE;
   virtual bool IsSyncable() OVERRIDE;
+  virtual bool MigrateToVersion(int version,
+                                const std::string& app_locale,
+                                bool* update_compatible_version) OVERRIDE;
 
   // Adds a new keyword, updating the id field on success.
   // Returns true if successful.
   bool AddKeyword(const TemplateURLData& data);
 
   // Removes the specified keyword.
   // Returns true if successful.
   bool RemoveKeyword(TemplateURLID id);
 
   // Loads the keywords into the specified vector. It's up to the caller to
@@ skipping 61 matching lines @@
                           std::string* result);
 
   // Migrates table |name| (which should be either "keywords" or
   // "keywords_backup") from version 44 to version 45.
   bool MigrateKeywordsTableForVersion45(const std::string& name);
 
   DISALLOW_COPY_AND_ASSIGN(KeywordTable);
 };
 
 #endif  // CHROME_BROWSER_WEBDATA_KEYWORD_TABLE_H_