Cleanup: Remove VersionUpdater::RelaunchBrowser interface method.

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

Index: chrome/browser/ui/webui/help/version_updater_win.cc
diff --git a/chrome/browser/ui/webui/help/version_updater_win.cc b/chrome/browser/ui/webui/help/version_updater_win.cc
index 1c869667d3f821aa2e5f93b0374f6fb6e4639aee..32861e2da6bac1ae42f76b2037ba1058e0d1f128 100644
--- a/chrome/browser/ui/webui/help/version_updater_win.cc
+++ b/chrome/browser/ui/webui/help/version_updater_win.cc
@@ -10,7 +10,6 @@
 #include "base/win/windows_version.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/first_run/upgrade_util.h"
-#include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_contents.h"
@@ -44,10 +43,6 @@ void VersionUpdaterWin::CheckForUpdate(const StatusCallback& callback,
   }
 }
 
-void VersionUpdaterWin::RelaunchBrowser() const {
-  chrome::AttemptRestart();
-}
-
 void VersionUpdaterWin::OnUpdateCheckComplete(
     const base::string16& new_version) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);