Move printing defines to buildflag system.

printing/printing_context_win.cc

Index: printing/printing_context_win.cc
diff --git a/printing/printing_context_win.cc b/printing/printing_context_win.cc
index 0b4a89b5c6aea2c5317ed25eea19d9681d6e2596..1a54439484e7c5ebd2335302d01815151cd8e9c0 100644
--- a/printing/printing_context_win.cc
+++ b/printing/printing_context_win.cc
@@ -14,6 +14,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "printing/backend/print_backend.h"
 #include "printing/backend/win_helper.h"
+#include "printing/features/features.h"
 #include "printing/print_settings_initializer_win.h"
 #include "printing/printed_document.h"
 #include "printing/printing_context_system_dialog_win.h"
@@ -35,7 +36,7 @@ void AssignResult(PrintingContext::Result* out, PrintingContext::Result in) {
 
 // static
 std::unique_ptr<PrintingContext> PrintingContext::Create(Delegate* delegate) {
-#if defined(ENABLE_BASIC_PRINTING)
+#if BUILDFLAG(ENABLE_BASIC_PRINTING)
   return base::WrapUnique(new PrintingContextSystemDialogWin(delegate));
 #else
   return base::WrapUnique(new PrintingContextWin(delegate));