chrome: Cleanup class/struct forward declarations

chrome/browser/printing/print_view_manager_base.h

 // Copyright 2013 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_VIEW_MANAGER_BASE_H_
 #define CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASE_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
 #include "build/build_config.h"
 #include "components/prefs/pref_member.h"
 #include "components/printing/browser/print_manager.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "printing/features/features.h"
 #include "printing/printed_pages_source.h"
 
 struct PrintHostMsg_DidPrintPage_Params;
 
 namespace content {
 class RenderFrameHost;
 }
 
 namespace printing {
 
 class JobEventDetails;
-class MetafilePlayer;
 class PrintJob;
 class PrintJobWorkerOwner;
 class PrintQueriesQueue;
 
 // Base class for managing the print commands for a WebContents.
 class PrintViewManagerBase : public content::NotificationObserver,
                              public PrintedPagesSource,
                              public PrintManager {
  public:
   ~PrintViewManagerBase() override;
@@ skipping 119 matching lines @@
   BooleanPrefMember printing_enabled_;
 
   scoped_refptr<printing::PrintQueriesQueue> queue_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintViewManagerBase);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASE_H_