Revert of More System Dialog printing code disabled on Windows.

chrome/browser/printing/print_view_manager_base.h

Index: chrome/browser/printing/print_view_manager_base.h
diff --git a/chrome/browser/printing/print_view_manager_base.h b/chrome/browser/printing/print_view_manager_base.h
index 96c07ad2509dca4be86f23e0135bb14e7396cc86..7a93fe1f3a4876f86f2a8cc2713e3ab3a75164b4 100644
--- a/chrome/browser/printing/print_view_manager_base.h
+++ b/chrome/browser/printing/print_view_manager_base.h
@@ -35,12 +35,10 @@ class PrintViewManagerBase : public content::NotificationObserver,
  public:
   virtual ~PrintViewManagerBase();
 
-#if !defined(OS_WIN)
   // Prints the current document immediately. Since the rendering is
   // asynchronous, the actual printing will not be completed on the return of
   // this function. Returns false if printing is impossible at the moment.
   virtual bool PrintNow();
-#endif  // !OS_WIN
 
   // Whether to block scripted printing for our tab or not.
   void UpdateScriptedPrintingBlocked();