Revert changes of parent::foo() to $this->foo() in areas it was incorrect

This reverts commit ee6435915378011dce3aff59c4736dc6ad97208d.

Conflicts:
	springboard/modules/springboard_views/handlers/queue_api_handler_field_batch_id.inc
	springboard/modules/springboard_views/handlers/springboard_webform_hidden_component_values.inc