Bug 656197 part 1. Remove the generic attr preparsing mechanism from BeforeSetAttr and just preparse class attributes directly in the one place that needs to do it. r=smaug

This removes the requirement that BeforeSetAttr comes before AttributeWillChange
(which needs the preparsed new value).

MozReview-Commit-ID: 87C6Mjc7ARh

dom/html/HTMLInputElement.cpp

@@ -1358,7 +1358,7 @@ HTMLInputElement::Clone(mozilla::dom::NodeInfo* aNodeInfo, nsINode** aResult) co
 
 nsresult
 HTMLInputElement::BeforeSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
-                                nsAttrValueOrString* aValue,
+                                const nsAttrValueOrString* aValue,
                                 bool aNotify)
 {
   if (aNameSpaceID == kNameSpaceID_None) {