[sql] Remove misleading AutoRecoverTable() parameter.

sql/recovery.h

Index: sql/recovery.h
diff --git a/sql/recovery.h b/sql/recovery.h
index c03ebb2b391b3a920ea576d5636e2a7e6fba94e4..2c191cf285eb4b3d7c68dfda395dae80647025a3 100644
--- a/sql/recovery.h
+++ b/sql/recovery.h
@@ -118,9 +118,8 @@ class SQL_EXPORT Recovery {
   // 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|.
@@ -134,9 +133,7 @@ class SQL_EXPORT Recovery {
   //
   // 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.