Cleanup: Remove unneeded forward declarations in printing, sandbox, and skia.

printing/printing_context_no_system_dialog.h

 // Copyright (c) 2011 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 PRINTING_PRINTING_CONTEXT_NO_SYSTEM_DIALOG_H_
 #define PRINTING_PRINTING_CONTEXT_NO_SYSTEM_DIALOG_H_
 
 #include <string>
 
 #include "printing/printing_context.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace printing {
 
-class Metafile;
-
 class PRINTING_EXPORT PrintingContextNoSystemDialog : public PrintingContext {
  public:
   explicit PrintingContextNoSystemDialog(const std::string& app_locale);
   virtual ~PrintingContextNoSystemDialog();
 
   // PrintingContext implementation.
   virtual void AskUserForSettings(gfx::NativeView parent_view,
                                   int max_pages,
                                   bool has_selection,
                                   PrintSettingsCallback* callback);
@@ skipping 10 matching lines @@
   virtual void ReleaseContext();
   virtual gfx::NativeDrawingContext context() const;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PrintingContextNoSystemDialog);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTING_CONTEXT_NO_SYSTEM_DIALOG_H_
-