Reverting 27379.

chrome/browser/printing/print_job.h

Index: chrome/browser/printing/print_job.h
===================================================================
--- chrome/browser/printing/print_job.h	(revision 27386)
+++ chrome/browser/printing/print_job.h	(working copy)
@@ -8,6 +8,7 @@
 #include "base/basictypes.h"
 #include "base/gfx/native_widget_types.h"
 #include "base/message_loop.h"
+#include "base/ref_counted.h"
 #include "chrome/browser/printing/print_job_worker_owner.h"
 #include "chrome/common/notification_registrar.h"
 
@@ -31,8 +32,9 @@
 // any state change. While printing, the PrintJobManager instance keeps a
 // reference to the job to be sure it is kept alive. All the code in this class
 // runs in the UI thread.
-class PrintJob : public PrintJobWorkerOwner,
+class PrintJob : public base::RefCountedThreadSafe<PrintJob>,
                  public NotificationObserver,
+                 public PrintJobWorkerOwner,
                  public MessageLoop::DestructionObserver {
  public:
   // Create a empty PrintJob. When initializing with this constructor,
@@ -50,6 +52,13 @@
                        const NotificationDetails& details);
 
   // PrintJobWorkerOwner
+  virtual void AddRef() {
+    return base::RefCountedThreadSafe<PrintJob>::AddRef();
+  }
+  virtual void Release() {
+    return base::RefCountedThreadSafe<PrintJob>::Release();
+  }
+
   virtual void GetSettingsDone(const PrintSettings& new_settings,
                                PrintingContext::Result result);
   virtual PrintJobWorker* DetachWorker(PrintJobWorkerOwner* new_owner);