Bug 1087737: Make JS callers of ios.newChannel call ios.newChannel2 in mobile/ (r=wesj)

mobile/android/components/HelperAppDialog.js

@@ -62,7 +62,12 @@ HelperAppLauncherDialog.prototype = {
     // For all other URIs, try to resolve them to an inner URI, and check that.
     if (!alreadyResolved) {
       let ioSvc = Cc["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);
-      let innerURI = ioSvc.newChannelFromURI(url).URI;
+      let innerURI = ioSvc.newChannelFromURI2(url,
+                                              null,      // aLoadingNode
+                                              Services.scriptSecurityManager.getSystemPrincipal(),
+                                              null,      // aTriggeringPrincipal
+                                              Ci.nsILoadInfo.SEC_NORMAL,
+                                              Ci.nsIContentPolicy.TYPE_OTHER).URI;
       if (!url.equals(innerURI)) {
         return this._canDownload(innerURI, true);
       }