Move PHUIErrorView to PHUIInfoView

Summary: Since this element isn't strictly about errors, re-label as info view instead.

Test Plan: Grepped for all callsites, tested UIExamples and a few other random pages.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: hach-que, Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11867

src/applications/daemon/controller/PhabricatorWorkerTaskDetailController.php

@@ -24,13 +24,13 @@ final class PhabricatorWorkerTaskDetailController
     if (!$task) {
       $title = pht('Task Does Not Exist');
 
-      $error_view = new PHUIErrorView();
+      $error_view = new PHUIInfoView();
       $error_view->setTitle(pht('No Such Task'));
       $error_view->appendChild(phutil_tag(
         'p',
         array(),
         pht('This task may have recently been garbage collected.')));
-      $error_view->setSeverity(PHUIErrorView::SEVERITY_NODATA);
+      $error_view->setSeverity(PHUIInfoView::SEVERITY_NODATA);
 
       $content = $error_view;
     } else {