chrome: Cleanup class/struct forward declarations

chrome/browser/printing/print_job.h

 // Copyright (c) 2012 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 <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "build/build_config.h"
 #include "chrome/browser/printing/print_job_worker_owner.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 namespace base {
 class RefCountedMemory;
 }
 
 namespace printing {
 
 class JobEventDetails;
 class MetafilePlayer;
-class PdfToEmfConverter;
 class PrintJobWorker;
 class PrintedDocument;
 class PrintedPage;
 class PrintedPagesSource;
 class PrinterQuery;
 
 // Manages the print work for a specific document. Talks to the printer through
 // PrintingContext through PrintJobWorker. Hides access to PrintingContext in a
 // worker thread so the caller never blocks. PrintJob will send notifications on
 // any state change. While printing, the PrintJobManager instance keeps a
@@ skipping 186 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_