Revert inadvertent change to DefaultDocumentLoader

Revert changes to DefaultDocumentLoader accidentally committed in 60532cb.

Author: philwebb

spring-beans/src/main/java/org/springframework/beans/factory/xml/DefaultDocumentLoader.java

@@ -91,7 +91,6 @@ protected DocumentBuilderFactory createDocumentBuilderFactory(int validationMode
 factory.setNamespaceAware(namespaceAware);
 
 if (validationMode != XmlValidationModeDetector.VALIDATION_NONE) {
-factory.setFeature("http://apache.org/xml/features/validation/schema", false);
 factory.setValidating(true);
 if (validationMode == XmlValidationModeDetector.VALIDATION_XSD) {
 // Enforce namespace aware for XSD...