Move printing defines to buildflag system.

chrome/browser/printing/printing_message_filter.cc

Index: chrome/browser/printing/printing_message_filter.cc
diff --git a/chrome/browser/printing/printing_message_filter.cc b/chrome/browser/printing/printing_message_filter.cc
index 6c416b40a0f2107e51a799fbff588f9b6a807cb7..a74f07e36283f51691c5bd228c3ded376a9d755b 100644
--- a/chrome/browser/printing/printing_message_filter.cc
+++ b/chrome/browser/printing/printing_message_filter.cc
@@ -21,8 +21,9 @@
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/child_process_host.h"
+#include "printing/features/features.h"
 
-#if defined(ENABLE_PRINT_PREVIEW)
+#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
 #include "chrome/browser/ui/webui/print_preview/print_preview_ui.h"
 #endif
 
@@ -98,7 +99,7 @@ bool PrintingMessageFilter::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER_DELAY_REPLY(PrintHostMsg_ScriptedPrint, OnScriptedPrint)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(PrintHostMsg_UpdatePrintSettings,
                                     OnUpdatePrintSettings)
-#if defined(ENABLE_PRINT_PREVIEW)
+#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
     IPC_MESSAGE_HANDLER(PrintHostMsg_CheckForCancel, OnCheckForCancel)
 #endif
     IPC_MESSAGE_UNHANDLED(handled = false)
@@ -305,7 +306,7 @@ void PrintingMessageFilter::OnUpdatePrintSettingsReply(
   }
 }
 
-#if defined(ENABLE_PRINT_PREVIEW)
+#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
 void PrintingMessageFilter::OnCheckForCancel(int32_t preview_ui_id,
                                              int preview_request_id,
                                              bool* cancel) {