Replace "self" with "static" in Geocoder Service to allow inheritance

I'm trying to replace the Geocoder service by a new one extending it to remove the call to drupal_set_message() in log() method.

Problem is that calls to this method are done using self::log($e->getMessage(), 'error');, so when using the child service, the function called is Geocoder::log() instead of SilentGeocoder::log().

My proposal is to replace those calls with static::log($e->getMessage(), 'error'); to allow inheritence.

PHPdoc reference: http://php.net/manual/en/language.oop5.late-static-bindings.php