Convert RLZ to a buildflag header

chrome/browser/browser_shutdown.cc

Index: chrome/browser/browser_shutdown.cc
diff --git a/chrome/browser/browser_shutdown.cc b/chrome/browser/browser_shutdown.cc
index cf324c89127829abcc9d9bbd2d6f9530ea220487..33c5ee6d82f5ac14f26ff0976e44b378db4f9b69 100644
--- a/chrome/browser/browser_shutdown.cc
+++ b/chrome/browser/browser_shutdown.cc
@@ -38,6 +38,7 @@
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/tracing_controller.h"
 #include "printing/features/features.h"
+#include "rlz/features/features.h"
 
 #if defined(OS_WIN)
 #include "chrome/browser/first_run/upgrade_util_win.h"
@@ -52,7 +53,7 @@
 #include "chrome/browser/background/background_mode_manager.h"
 #endif
 
-#if defined(ENABLE_RLZ)
+#if BUILDFLAG(ENABLE_RLZ)
 #include "components/rlz/rlz_tracker.h"
 #endif
 
@@ -175,7 +176,7 @@ bool ShutdownPreThreadsStop() {
 
   prefs->CommitPendingWrite();
 
-#if defined(ENABLE_RLZ)
+#if BUILDFLAG(ENABLE_RLZ)
   // Cleanup any statics created by RLZ. Must be done before NotificationService
   // is destroyed.
   rlz::RLZTracker::CleanupRlz();