Revert of More System Dialog printing code disabled on Windows.

chrome/browser/ui/webui/print_preview/print_preview_handler.h

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.h
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.h b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
index b92d3ec9403aa23b9787f7f5d3abab5c645a2b90..b98bffdfbaf0d6770d628df87aafa9caa528b509 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.h
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
@@ -79,11 +79,9 @@ class PrintPreviewHandler
   // Called when print preview failed.
   void OnPrintPreviewFailed();
 
-#if !defined(OS_WIN)
   // Called when the user press ctrl+shift+p to display the native system
   // dialog.
   void ShowSystemDialog();
-#endif  // !OS_WIN
 
 #if defined(ENABLE_SERVICE_DISCOVERY)
   // PrivetLocalPrinterLister::Delegate implementation.
@@ -151,11 +149,9 @@ class PrintPreviewHandler
   // Gets the printer capabilities. First element of |args| is the printer name.
   void HandleGetPrinterCapabilities(const base::ListValue* args);
 
-#if !defined(OS_WIN)
   // Asks the initiator renderer to show the native print system dialog. |args|
   // is unused.
   void HandleShowSystemDialog(const base::ListValue* args);
-#endif  // !OS_WIN
 
   // Callback for the signin dialog to call once signin is complete.
   void OnSigninComplete();