code: function() {
  			var annotationModel = this.getAnnotationModel();
  			var textModel = this.getModel();
  			if (textModel.getBaseModel) {
  				textModel = textModel.getBaseModel();
  			}
  			var type = AT.ANNOTATION_HIGHLIGHTED_LINE;
  			var annotations = annotationModel.getAnnotations(0, textModel.getCharCount());
  			var remove = null;
  			while (annotations.hasNext()) {
  				var annotation = annotations.next();
  				if (annotation.type === type) {
  					remove = annotation;
  					break;
  				}
  			}
  			if (remove) {
  				annotationModel.removeAnnotation(remove);
  			}
  		}
docs: Unhightlight the highlighted line