Get HTML5 minlength working.

Adding minLength=X to an input element would not work, whereas maxLength=X would work.

This change gets minLength=X working.

src/browser/ui/dom/HTMLDOMPropertyConfig.js

@@ -115,6 +115,7 @@ var HTMLDOMPropertyConfig = {
     mediaGroup: null,
     method: null,
     min: null,
+    minLength: MUST_USE_ATTRIBUTE,
     multiple: MUST_USE_PROPERTY | HAS_BOOLEAN_VALUE,
     muted: MUST_USE_PROPERTY | HAS_BOOLEAN_VALUE,
     name: null,