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

chrome/browser/webdata/web_database.h

Index: chrome/browser/webdata/web_database.h
diff --git a/chrome/browser/webdata/web_database.h b/chrome/browser/webdata/web_database.h
index e743f38b0d86921185dc7e66577da82f1098a11f..0f0f4b022c3c2c8af7f9cf3d9047c38e6953958b 100644
--- a/chrome/browser/webdata/web_database.h
+++ b/chrome/browser/webdata/web_database.h
@@ -43,6 +43,14 @@ class WebDatabase {
   sql::Connection* GetSQLConnection();
 
  private:
+  // Change the version number and possibly the compatibility version of

[dhollowa, 2011/04/04 16:13:20]

These would be better pulled into the .cc as utility functions within the
anonymous namespace.

[Bons, 2011/04/05 11:05:13]

Done.

+  // |meta_table_|.
+  void ChangeVersion(int version_num, bool update_compatible_version_num);
+
+  // Outputs the failed version number as a warning and always returns
+  // |sql::INIT_FAILURE|.
+  sql::InitStatus FailedMigrationTo(int version_num);
+
   // Used by |Init()| to migration database schema from older versions to
   // current version.
   sql::InitStatus MigrateOldVersionsAsNeeded();