Guarded shrink setting with ifdefs to make clear where it is used.

printing/printed_document.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 PRINTING_PRINTED_DOCUMENT_H_
 #define PRINTING_PRINTED_DOCUMENT_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
@@ skipping 24 matching lines @@
     : public base::RefCountedThreadSafe<PrintedDocument> {
  public:
   // The cookie shall be unique and has a specific relationship with its
   // originating source and settings.
   PrintedDocument(const PrintSettings& settings,
                   PrintedPagesSource* source,
                   int cookie);
 
   // Sets a page's data. 0-based. Takes metafile ownership.
   // Note: locks for a short amount of time.
-  void SetPage(int page_number, Metafile* metafile, double shrink,
-               const gfx::Size& paper_size, const gfx::Rect& page_rect);
+  void SetPage(int page_number,
+               Metafile* metafile,
+#if defined(OS_WIN)
+               double shrink,
+#endif  // OS_WIN
+               const gfx::Size& paper_size,
+               const gfx::Rect& page_rect);
 
   // Retrieves a page. If the page is not available right now, it
   // requests to have this page be rendered and returns false.
   // Note: locks for a short amount of time.
   bool GetPage(int page_number, scoped_refptr<PrintedPage>* page);
 
   // Draws the page in the context.
   // Note: locks for a short amount of time in debug only.
 #if defined(OS_WIN) || defined(OS_MACOSX) && !defined(USE_AURA)
   void RenderPrintedPage(const PrintedPage& page,
@@ skipping 114 matching lines @@
 
   // All the immutable members.
   const Immutable immutable_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintedDocument);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTED_DOCUMENT_H_