Convert //chrome/browser/ui from scoped_ptr to std::unique_ptr

chrome/browser/ui/login/login_handler.h

Index: chrome/browser/ui/login/login_handler.h
diff --git a/chrome/browser/ui/login/login_handler.h b/chrome/browser/ui/login/login_handler.h
index fe0dc063eb536140088e2148218564ab744a049d..8561b73800857820a4fbbb0fe8fb65eab0c98056 100644
--- a/chrome/browser/ui/login/login_handler.h
+++ b/chrome/browser/ui/login/login_handler.h
@@ -198,7 +198,7 @@ class LoginHandler : public content::ResourceDispatcherHostLoginDelegate,
 
   // Observes other login handlers so this login handler can respond.
   // This is only accessed on the UI thread.
-  scoped_ptr<content::NotificationRegistrar> registrar_;
+  std::unique_ptr<content::NotificationRegistrar> registrar_;
 
   base::WeakPtr<LoginInterstitialDelegate> interstitial_delegate_;
 };