Bug 1148030 - Correctly reflect object and embed RequestContext values; r=smaug

Note that these elements cannot be intercepted for now.  See bug
1168676 for the background.

dom/html/HTMLSharedObjectElement.h

@@ -207,6 +207,8 @@ private:
            nsGkAtoms::src;
   }
 
+  nsContentPolicyType GetContentPolicyType() const override;
+
   // mIsDoneAddingChildren is only really used for <applet>.  This boolean is
   // always true for <embed>, per the documentation in nsIContent.h.
   bool mIsDoneAddingChildren;