Bug 1291971 - Part 4, enable controller startNewPresentation_error test. r=smaug.

MozReview-Commit-ID: 51dfCphD0XJ

--HG--
extra : rebase_source : 41fdcef117c34fe45588ee8f4f71f99ed2987748

dom/presentation/PresentationService.cpp

@@ -642,7 +642,7 @@ PresentationService::StartSession(
     nsCOMPtr<nsIPresentationDevicePrompt> prompt =
       do_GetService(PRESENTATION_DEVICE_PROMPT_CONTRACTID);
     if (NS_WARN_IF(!prompt)) {
-      return aCallback->NotifyError(NS_ERROR_DOM_OPERATION_ERR);
+      return aCallback->NotifyError(NS_ERROR_DOM_INVALID_ACCESS_ERR);
     }
 
     nsresult rv = prompt->PromptDeviceSelection(request);

testing/web-platform/meta/presentation-api/controlling-ua/startNewPresentation_error.html.ini

@@ -1,3 +1,6 @@
 [startNewPresentation_error.html]
   type: testharness
-  expected: ERROR
+  prefs: [dom.presentation.enabled: true,
+          dom.presentation.controller.enabled: true,
+          dom.presentation.discovery.enabled: true,
+          dom.presentation.device.name: "Firefox"]