Report print jobs that are aborted by CUPS as errors.

chrome/browser/chromeos/printing/cups_print_job_notification_manager.cc

Index: chrome/browser/chromeos/printing/cups_print_job_notification_manager.cc
diff --git a/chrome/browser/chromeos/printing/cups_print_job_notification_manager.cc b/chrome/browser/chromeos/printing/cups_print_job_notification_manager.cc
index b7a6636416432e87d7592ee25f6a8d7d0eb9741f..ea97d265ab695dda8876aeb6df9e506c7705d9f9 100644
--- a/chrome/browser/chromeos/printing/cups_print_job_notification_manager.cc
+++ b/chrome/browser/chromeos/printing/cups_print_job_notification_manager.cc
@@ -60,4 +60,11 @@ void CupsPrintJobNotificationManager::OnPrintJobError(CupsPrintJob* job) {
   notification_map_[job]->OnPrintJobStatusUpdated();
 }
 
+void CupsPrintJobNotificationManager::OnPrintJobCancelled(CupsPrintJob* job) {
+  auto notification = notification_map_.find(job);

[xdai1, 2017/02/24 19:17:00]

Why not use the same format in the other functions? e.g.:
DCHECK(base::ContainsKey(notification_map_, job));
notification_map_[job]->OnPrintJobStatusUpdated();

[skau, 2017/02/24 23:09:34]

I've changed it.  I had thought notifications were removed from the map after
they're dismissed but it seems like this never happens.

+  if (notification != notification_map_.end()) {
+    notification->second->OnPrintJobStatusUpdated();
+  }
+}
+
 }  // namespace chromeos