Cleanup jobs which have failed.

chrome/browser/chromeos/printing/cups_print_job_manager.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_PRINTING_CUPS_PRINT_JOB_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_PRINTING_CUPS_PRINT_JOB_MANAGER_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 35 matching lines @@
 
   static CupsPrintJobManager* CreateInstance(Profile* profile);
 
   explicit CupsPrintJobManager(Profile* profile);
   ~CupsPrintJobManager() override;
 
   // KeyedService override:
   void Shutdown() override;
 
   // Cancel a print job |job|. Note the |job| will be deleted after cancelled.
-  virtual bool CancelPrintJob(CupsPrintJob* job) = 0;
+  // There will be no notifications after cancellation.
+  virtual void CancelPrintJob(CupsPrintJob* job) = 0;
   virtual bool SuspendPrintJob(CupsPrintJob* job) = 0;
   virtual bool ResumePrintJob(CupsPrintJob* job) = 0;
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
  protected:
   void NotifyJobCreated(CupsPrintJob* job);
   void NotifyJobStarted(CupsPrintJob* job);
   void NotifyJobUpdated(CupsPrintJob* job);
   void NotifyJobResumed(CupsPrintJob* job);
   void NotifyJobSuspended(CupsPrintJob* job);
   void NotifyJobCanceled(CupsPrintJob* job);
   void NotifyJobError(CupsPrintJob* job);
   void NotifyJobDone(CupsPrintJob* job);
 
   Profile* profile_;
   std::unique_ptr<CupsPrintJobNotificationManager> notification_manager_;
   base::ObserverList<Observer> observers_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CupsPrintJobManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PRINTING_CUPS_PRINT_JOB_MANAGER_H_