Cleanup: Remove VersionUpdater::RelaunchBrowser interface method.

chrome/browser/ui/webui/settings/about_handler.cc

Index: chrome/browser/ui/webui/settings/about_handler.cc
diff --git a/chrome/browser/ui/webui/settings/about_handler.cc b/chrome/browser/ui/webui/settings/about_handler.cc
index 3b62a0f21af19f8b55909337f6a721f2cc02d55c..131bd29ccb70a2fd56045a968b38f110a476a70b 100644
--- a/chrome/browser/ui/webui/settings/about_handler.cc
+++ b/chrome/browser/ui/webui/settings/about_handler.cc
@@ -26,6 +26,7 @@
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/obsolete_system/obsolete_system.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
@@ -464,7 +465,7 @@ void AboutHandler::PromoteUpdater(const base::ListValue* args) {
 
 void AboutHandler::HandleRelaunchNow(const base::ListValue* args) {
   DCHECK(args->empty());
-  version_updater_->RelaunchBrowser();
+  chrome::AttemptRelaunch();
 }
 
 void AboutHandler::HandleOpenFeedbackDialog(const base::ListValue* args) {