Reverting 27379.

chrome/browser/printing/printer_query.h

 // Copyright (c) 2006-2008 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_PRINTING_PRINTER_QUERY_H_
 #define CHROME_BROWSER_PRINTING_PRINTER_QUERY_H_
 
 #include "base/scoped_ptr.h"
+#include "base/ref_counted.h"
 #include "chrome/browser/printing/print_job_worker_owner.h"
 
 class CancelableTask;
 class MessageLoop;
 
 namespace base {
 class Thread;
 }
 
 namespace printing {
 
 class PrintJobWorker;
 
 // Query the printer for settings.
-class PrinterQuery : public PrintJobWorkerOwner {
+class PrinterQuery : public base::RefCountedThreadSafe<PrinterQuery>,
+                     public PrintJobWorkerOwner {
  public:
   // GetSettings() UI parameter.
   enum GetSettingsAskParam {
     DEFAULTS,
     ASK_USER,
   };
 
   PrinterQuery();
   virtual ~PrinterQuery();
 
   // PrintJobWorkerOwner
+  virtual void AddRef() {
+    return base::RefCountedThreadSafe<PrinterQuery>::AddRef();
+  }
+  virtual void Release() {
+    return base::RefCountedThreadSafe<PrinterQuery>::Release();
+  }
   virtual void GetSettingsDone(const PrintSettings& new_settings,
                                PrintingContext::Result result);
   virtual PrintJobWorker* DetachWorker(PrintJobWorkerOwner* new_owner);
   virtual MessageLoop* message_loop() {
     return ui_message_loop_;
   }
   virtual const PrintSettings& settings() const { return settings_; }
 
   virtual int cookie() const { return cookie_; }
 
@@ skipping 45 matching lines @@
 
   // Task waiting to be executed.
   scoped_ptr<CancelableTask> callback_;
 
   DISALLOW_COPY_AND_ASSIGN(PrinterQuery);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINTER_QUERY_H_