Drop a table.
$table: The table to be dropped.
TRUE if the table was successfully dropped, FALSE if there was no table by that name to begin with.
Overrides Schema::dropTable
public function dropTable($table) {
  if (!$this
    ->tableExists($table)) {
    return FALSE;
  }
  $this->connection->tableDropped = TRUE;
  $this->connection
    ->query('DROP TABLE {' . $table . '}');
  return TRUE;
}