Move migration code out of WebDatabase and into table-specific classes.

chrome/browser/webdata/keyword_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_KEYWORD_TABLE_H_
 #define CHROME_BROWSER_WEBDATA_KEYWORD_TABLE_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 63 matching lines @@
   bool UpdateKeyword(const TemplateURL& url);
 
   // ID (TemplateURL->id) of the default search provider.
   bool SetDefaultSearchProviderID(int64 id);
   int64 GetDefaulSearchProviderID();
 
   // Version of the built-in keywords.
   bool SetBuitinKeywordVersion(int version);
   int GetBuitinKeywordVersion();
 
+  // Table migration functions.
+  bool MigrateToVersion21AutoGenerateKeywordColumn();
+  bool MigrateToVersion25AddLogoIDColumn();
+  bool MigrateToVersion26AddCreatedByPolicyColumn();
+  bool MigrateToVersion28SupportsInstantColumn();
+  bool MigrateToVersion29InstantUrlToSupportsInstant();
+
  private:
   DISALLOW_COPY_AND_ASSIGN(KeywordTable);
 };
 
 #endif  // CHROME_BROWSER_WEBDATA_KEYWORD_TABLE_H_