[sql] Remove misleading AutoRecoverTable() parameter.

sql/recovery.h

 // Copyright 2013 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 SQL_RECOVERY_H_
 #define SQL_RECOVERY_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 100 matching lines @@
 
   // Handle to the temporary recovery database.
   sql::Connection* db() { return &recover_db_; }
 
   // Attempt to recover the named table from the corrupt database into
   // the recovery database using a temporary recover virtual table.
   // The virtual table schema is derived from the named table's schema
   // in database [main].  Data is copied using INSERT OR REPLACE, so
   // duplicates overwrite each other.
   //
-  // |extend_columns| allows recovering tables which have excess
-  // columns relative to the target schema.  The recover virtual table
-  // treats more data than specified as a sign of corruption.
+  // If the source table has fewer columns than the target, the target
+  // DEFAULT value will be used for those columns.
   //
   // Returns true if all operations succeeded, with the number of rows
   // recovered in |*rows_recovered|.
   //
   // NOTE(shess): Due to a flaw in the recovery virtual table, at this
   // time this code injects the DEFAULT value of the target table in
   // locations where the recovery table returns NULL.  This is not
   // entirely correct, because it happens both when there is a short
   // row (correct) but also where there is an actual NULL value
   // (incorrect).
   //
   // TODO(shess): Flag for INSERT OR REPLACE vs IGNORE.
   // TODO(shess): Handle extended table names.
-  bool AutoRecoverTable(const char* table_name,
-                        size_t extend_columns,
-                        size_t* rows_recovered);
+  bool AutoRecoverTable(const char* table_name, size_t* rows_recovered);
 
   // Setup a recover virtual table at temp.recover_meta, reading from
   // corrupt.meta.  Returns true if created.
   // TODO(shess): Perhaps integrate into Begin().
   // TODO(shess): Add helpers to fetch additional items from the meta
   // table as needed.
   bool SetupMeta();
 
   // Fetch the version number from temp.recover_meta.  Returns false
   // if the query fails, or if there is no version row.  Otherwise
@@ skipping 23 matching lines @@
 
   Connection* db_;         // Original database connection.
   Connection recover_db_;  // Recovery connection.
 
   DISALLOW_COPY_AND_ASSIGN(Recovery);
 };
 
 }  // namespace sql
 
 #endif  // SQL_RECOVERY_H_