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/HTMLTrackElement.cpp

@@ -218,6 +218,7 @@ bool
 HTMLTrackElement::ParseAttribute(int32_t aNamespaceID,
                                  nsAtom* aAttribute,
                                  const nsAString& aValue,
+                                 nsIPrincipal* aMaybeScriptedPrincipal,
                                  nsAttrValue& aResult)
 {
   if (aNamespaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::kind) {
@@ -230,6 +231,7 @@ HTMLTrackElement::ParseAttribute(int32_t aNamespaceID,
   return nsGenericHTMLElement::ParseAttribute(aNamespaceID,
                                               aAttribute,
                                               aValue,
+                                              aMaybeScriptedPrincipal,
                                               aResult);
 }