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

chrome/browser/printing/print_view_manager_base.cc

Index: chrome/browser/printing/print_view_manager_base.cc
diff --git a/chrome/browser/printing/print_view_manager_base.cc b/chrome/browser/printing/print_view_manager_base.cc
index f10180891110e44923841330f69b777a5804b4c6..57acaa1e7f95cf226e9adca250576f2aa943f225 100644
--- a/chrome/browser/printing/print_view_manager_base.cc
+++ b/chrome/browser/printing/print_view_manager_base.cc
@@ -220,10 +220,12 @@ void PrintViewManagerBase::OnDidPrintPage(
 #if !defined(WIN_PDF_METAFILE_FOR_PRINTING)
   // Update the rendered document. It will send notifications to the listener.
   document->SetPage(params.page_number,
-    metafile.release(),
-    params.actual_shrink,
-    params.page_size,
-    params.content_area);
+                    metafile.release(),
+#if defined(OS_WIN)
+                    params.actual_shrink,
+#endif  // OS_WIN
+                    params.page_size,
+                    params.content_area);
 
   ShouldQuitFromInnerMessageLoop();
 #else