Bug 1366862 add object_subrequest to types, r=aswan

MozReview-Commit-ID: GIjIycOUNAo

--HG--
extra : rebase_source : f8f61b43362b65ce8e6d40aab8be2b7987621bf0

toolkit/components/extensions/schemas/web_request.json

@@ -39,6 +39,7 @@
           "script",
           "image",
           "object",
+          "object_subrequest",
           "xmlhttprequest",
           "xbl",
           "xslt",