Attempt four at landing the "histogram.h removed from message_loop.h" patch.

chrome/browser/printing/print_job.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_PRINT_JOB_H_
 #define CHROME_BROWSER_PRINTING_PRINT_JOB_H_
 
 #include "base/basictypes.h"
 #include "base/message_loop.h"
+#include "base/scoped_ptr.h"
 #include "chrome/browser/printing/print_job_worker_owner.h"
 #include "chrome/common/notification_registrar.h"
 #include "gfx/native_widget_types.h"
 
 class GURL;
 class Thread;
 
 namespace printing {
 
 // See definition below.
@@ skipping 178 matching lines @@
   scoped_refptr<PrintedDocument> document_;
   scoped_refptr<PrintedPage> page_;
   const Type type_;
 
   DISALLOW_COPY_AND_ASSIGN(JobEventDetails);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_JOB_H_