Bug 1451169 - Use nsStaticAtom* instead of nsStaticAtom** in Element.h. r=baku

And then fix up everything else that needs to change as well.

MozReview-Commit-ID: GDMfERqdQAc

dom/html/HTMLPreElement.cpp

@@ -62,7 +62,7 @@ HTMLPreElement::IsAttributeMapped(const nsAtom* aAttribute) const
   }
 
   static const MappedAttributeEntry attributes[] = {
-    { &nsGkAtoms::wrap },
+    { nsGkAtoms::wrap },
     { nullptr },
   };