Bug 1023484 - Improvements and test for the initial requestAutocomplete stub. r=MattN

--HG--
rename : toolkit/components/formautofill/AutofillController.js => toolkit/components/formautofill/FormAutofillContentService.js
rename : toolkit/components/formautofill/nsIAutofillController.idl => toolkit/components/formautofill/nsIFormAutofillContentService.idl