Cleanup: Remove VersionUpdater::RelaunchBrowser interface method.

chrome/browser/ui/webui/help/version_updater_basic.cc

Index: chrome/browser/ui/webui/help/version_updater_basic.cc
diff --git a/chrome/browser/ui/webui/help/version_updater_basic.cc b/chrome/browser/ui/webui/help/version_updater_basic.cc
index e742310c6037dda4755b1e260e7d58c2fe452460..2cd9126ee6231e95458ef89d643020b982dae746 100644
--- a/chrome/browser/ui/webui/help/version_updater_basic.cc
+++ b/chrome/browser/ui/webui/help/version_updater_basic.cc
@@ -5,7 +5,6 @@
 #include "chrome/browser/ui/webui/help/version_updater_basic.h"
 
 #include "base/strings/string16.h"
-#include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/upgrade_detector.h"
 
 void VersionUpdaterBasic::CheckForUpdate(
@@ -17,10 +16,6 @@ void VersionUpdaterBasic::CheckForUpdate(
     status_callback.Run(DISABLED, 0, base::string16());
 }
 
-void VersionUpdaterBasic::RelaunchBrowser() const {
-  chrome::AttemptRestart();
-}
-
 VersionUpdater* VersionUpdater::Create(content::WebContents* web_contents) {
   return new VersionUpdaterBasic;
 }