Bug 1321247, sanitize forms out of the RSS reader, r=dveditz

MozReview-Commit-ID: DOPHvrYv3wJ

--HG--
extra : rebase_source : 8f717e1cb660103be4eb8b3f479252fb95050a41

toolkit/components/feeds/FeedProcessor.js

@@ -625,7 +625,8 @@ TextConstruct.prototype = {
     else
       return null;
 
-    return this.parserUtils.parseFragment(this.text, 0, isXML,
+    let flags = Ci.nsIParserUtils.SanitizerDropForms;
+    return this.parserUtils.parseFragment(this.text, flags, isXML,
                                           this.base, element);
   },