Extracted MetafilePlayer interface from printing::MetafilePlayer.

chrome/renderer/printing/print_web_view_helper_mac.mm

 // 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.
 
 #include "chrome/renderer/printing/print_web_view_helper.h"
 
 #import <AppKit/AppKit.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
@@ skipping 68 matching lines @@
              true, initial_render_metafile, &page_size, NULL);
   print_preview_context_.RenderedPreviewPage(
       base::TimeTicks::Now() - begin_time);
 
   if (draft_metafile.get()) {
     draft_metafile->FinishDocument();
   } else {
     if (print_preview_context_.IsModifiable() &&
         print_preview_context_.generate_draft_pages()) {
       DCHECK(!draft_metafile.get());
-      draft_metafile.reset(
-          print_preview_context_.metafile()->GetMetafileForCurrentPage());
+      draft_metafile =
+          print_preview_context_.metafile()->GetMetafileForCurrentPage();
     }
   }
   return PreviewPageRendered(page_number, draft_metafile.get());
 }
 
 void PrintWebViewHelper::RenderPage(const PrintMsg_Print_Params& params,
                                     int page_number,
                                     WebFrame* frame,
                                     bool is_preview,
                                     PdfMetafileSkia* metafile,
@@ skipping 41 matching lines @@
     }
     RenderPageContent(frame, page_number, canvas_area, content_area,
                       scale_factor, canvas_ptr);
   }
 
   // Done printing. Close the device context to retrieve the compiled metafile.
   metafile->FinishPage();
 }
 
 }  // namespace printing