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/HTMLObjectElement.h

@@ -70,6 +70,7 @@ public:
   virtual bool ParseAttribute(int32_t aNamespaceID,
                                 nsAtom *aAttribute,
                                 const nsAString &aValue,
+                                nsIPrincipal* aMaybeScriptedPrincipal,
                                 nsAttrValue &aResult) override;
   virtual nsMapRuleToAttributesFunc GetAttributeMappingFunction() const override;
   NS_IMETHOD_(bool) IsAttributeMapped(const nsAtom *aAttribute) const override;