Fix smelly scoped_ptr code in print_web_view_helper_win.

chrome/renderer/print_web_view_helper.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 CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 #define CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 #pragma once
 
 #include <utility>
 #include <vector>
@@ skipping 210 matching lines @@
                          const gfx::Size& canvas_size,
                          WebKit::WebFrame* frame);
 #endif
 
   // Render the frame for printing.
   bool RenderPagesForPrint(WebKit::WebFrame* frame, WebKit::WebNode* node,
                            PrepareFrameAndViewForPrint* prepare);
 
   // Platform specific helper function for rendering page(s) to |metafile|.
 #if defined(OS_WIN)
-  void RenderPage(const PrintMsg_Print_Params& params, float* scale_factor,
-                  int page_number, bool is_preview, WebKit::WebFrame* frame,
-                  scoped_ptr<printing::Metafile>* metafile);
+  // Because of mixed support for alpha channels on printers, this method may
+  // need to create a new metafile.  The result may be either the passed
+  // |metafile| or a new one.  In either case, the caller owns both |metafile|
+  // and the result.
+  printing::Metafile* RenderPage(const PrintMsg_Print_Params& params,
+                                 float* scale_factor, int page_number,
+                                 bool is_preview, WebKit::WebFrame* frame,
+                                 printing::Metafile* metafile);
 #elif defined(OS_MACOSX)
   void RenderPage(const gfx::Size& page_size, const gfx::Rect& content_area,
                   const float& scale_factor, int page_number,
                   WebKit::WebFrame* frame, printing::Metafile* metafile);
 #elif defined(OS_POSIX)
   bool RenderPages(const PrintMsg_PrintPages_Params& params,
                    WebKit::WebFrame* frame, WebKit::WebNode* node,
                    int* page_count, PrepareFrameAndViewForPrint* prepare,
                    printing::Metafile* metafile);
 #endif  // defined(OS_WIN)
@@ skipping 146 matching lines @@
 
     State state_;
   };
 
   PrintPreviewContext print_preview_context_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintWebViewHelper);
 };
 
 #endif  // CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_