Bug 1415352: Part 1a - Pass subject principal through to ParseAttribute. r=bz

This is necessary in order to parse style attributes using the subject
principal of the caller, rather than defaulting to the page principal.

MozReview-Commit-ID: GIshajQ28la

dom/html/HTMLFormElement.cpp

@@ -279,6 +279,7 @@ bool
 HTMLFormElement::ParseAttribute(int32_t aNamespaceID,
                                 nsAtom* aAttribute,
                                 const nsAString& aValue,
+                                nsIPrincipal* aMaybeScriptedPrincipal,
                                 nsAttrValue& aResult)
 {
   if (aNamespaceID == kNameSpaceID_None) {
@@ -294,7 +295,7 @@ HTMLFormElement::ParseAttribute(int32_t aNamespaceID,
   }
 
   return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
-                                              aResult);
+                                              aMaybeScriptedPrincipal, aResult);
 }
 
 nsresult