Add ScopedKeepAlive to c/b/lifetime

chrome/browser/ui/views/profiles/user_manager_view.cc

Index: chrome/browser/ui/views/profiles/user_manager_view.cc
diff --git a/chrome/browser/ui/views/profiles/user_manager_view.cc b/chrome/browser/ui/views/profiles/user_manager_view.cc
index 87d56b97a998d84998ad4d599b2e1cf3db40c78b..e3d1857ee0637d196231cd455eb49498ef933066 100644
--- a/chrome/browser/ui/views/profiles/user_manager_view.cc
+++ b/chrome/browser/ui/views/profiles/user_manager_view.cc
@@ -9,7 +9,7 @@
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
-#include "chrome/browser/lifetime/application_lifetime.h"
+#include "chrome/browser/lifetime/scoped_keep_alive.h"
 #include "chrome/browser/profiles/profile_avatar_icon_util.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/profiles/profile_metrics.h"
@@ -234,9 +234,8 @@ void UserManager::ShowReauthDialog(content::BrowserContext* browser_context,
 
 UserManagerView::UserManagerView()
     : web_view_(NULL),
-      keep_alive_(new AutoKeepAlive(NULL)),
-      user_manager_started_showing_(base::Time()) {
-}
+      keep_alive_(AutoKeepAlive(nullptr)),
+      user_manager_started_showing_(base::Time()) {}
 
 UserManagerView::~UserManagerView() {
 }