Bug 1235290 - Allow test_persistentdatablock_gonk.js to be longer. r=me

b2g/components/test/unit/xpcshell.ini

@@ -52,6 +52,9 @@ head = file_killswitch.js
 skip-if = ((toolkit != "gonk") || (toolkit == "gonk" && debug))
 
 [test_persistentdatablock_gonk.js]
+# can be slow because of what the test does, so let's give it some more time
+# to avoid intermittents: bug 1235290
+requesttimeoutfactor = 2
 head = file_persistentdatablock.js
 skip-if = (toolkit != "gonk")