cros: Enable WebUILoginView reuse.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
index 2b9092ecb44bfedf82aee436df01739878b803c3..473c8ffb6a6935a85e7cafbc3fc7be15f40f3516 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
@@ -894,12 +894,7 @@ void SigninScreenHandler::ReloadGaia(bool force_reload) {
 }
 
 void SigninScreenHandler::Initialize() {
-  // If delegate_ is nullptr here (e.g. WebUIScreenLocker has been destroyed),
-  // don't do anything, just return.
-  if (!delegate_)
-    return;
-
-  if (show_on_init_) {
+  if (delegate_ && show_on_init_) {
     show_on_init_ = false;
     ShowImpl();
   }