Move printing defines to buildflag system.

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

Index: chrome/browser/ui/webui/print_preview/print_preview_ui.h
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_ui.h b/chrome/browser/ui/webui/print_preview/print_preview_ui.h
index f73b4a6f2a2664fb4b050214cf4fb641925699ea..fa9d79e32597bfe5887d69d01cc03e84bdcebb99 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_ui.h
+++ b/chrome/browser/ui/webui/print_preview/print_preview_ui.h
@@ -15,6 +15,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "chrome/browser/ui/webui/constrained_web_dialog_ui.h"
+#include "printing/features/features.h"
 
 class PrintPreviewDataService;
 class PrintPreviewHandler;
@@ -87,7 +88,7 @@ class PrintPreviewUI : public ConstrainedWebDialogUI {
   // Notifies the Web UI of a print preview request with |request_id|.
   void OnPrintPreviewRequest(int request_id);
 
-#if defined(ENABLE_BASIC_PRINTING)
+#if BUILDFLAG(ENABLE_BASIC_PRINTING)
   // Notifies the Web UI to show the system dialog.
   void OnShowSystemDialog();
 #endif  // ENABLE_BASIC_PRINTING