Convert RLZ to a buildflag header

chrome/browser/ui/startup/startup_browser_creator_impl.cc

Index: chrome/browser/ui/startup/startup_browser_creator_impl.cc
diff --git a/chrome/browser/ui/startup/startup_browser_creator_impl.cc b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
index b088b9649494180310c986925cd95a41dc6064cb..214243e6cbb66dc3dda73aa856f4eae4792fb0b2 100644
--- a/chrome/browser/ui/startup/startup_browser_creator_impl.cc
+++ b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
@@ -103,6 +103,7 @@
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_set.h"
 #include "net/base/network_change_notifier.h"
+#include "rlz/features/features.h"
 #include "ui/base/l10n/l10n_util.h"
 
 #if defined(OS_MACOSX)
@@ -117,7 +118,7 @@
 #include "chrome/browser/shell_integration_win.h"
 #endif
 
-#if defined(ENABLE_RLZ)
+#if BUILDFLAG(ENABLE_RLZ)
 #include "components/rlz/rlz_tracker.h"  // nogncheck
 #endif
 
@@ -471,12 +472,12 @@ Browser* StartupBrowserCreatorImpl::OpenTabsInBrowser(Browser* browser,
                                    : WindowOpenDisposition::NEW_BACKGROUND_TAB;
     params.tabstrip_add_types = add_types;
 
-#if defined(ENABLE_RLZ)
+#if BUILDFLAG(ENABLE_RLZ)
     if (process_startup && google_util::IsGoogleHomePageUrl(tabs[i].url)) {
       params.extra_headers = rlz::RLZTracker::GetAccessPointHttpHeader(
           rlz::RLZTracker::ChromeHomePage());
     }
-#endif  // defined(ENABLE_RLZ)
+#endif  // BUILDFLAG(ENABLE_RLZ)
 
     chrome::Navigate(&params);