cros: Various fixes needed for preloading lock screen.

chrome/browser/chromeos/login/lock/webui_screen_locker.cc

Index: chrome/browser/chromeos/login/lock/webui_screen_locker.cc
diff --git a/chrome/browser/chromeos/login/lock/webui_screen_locker.cc b/chrome/browser/chromeos/login/lock/webui_screen_locker.cc
index df0ef9d180da68b7e90a6553d7f2fce0bf1d91f5..cf9824bda8468b709cab8da80d17efd852ff3c43 100644
--- a/chrome/browser/chromeos/login/lock/webui_screen_locker.cc
+++ b/chrome/browser/chromeos/login/lock/webui_screen_locker.cc
@@ -106,7 +106,8 @@ void WebUIScreenLocker::Preload() {
       SharedWebViewFactory::GetForProfile(ProfileHelper::GetSigninProfile());
 
   scoped_refptr<WebViewHandle> web_view_handle;
-  if (!shared_web_view->Get(GURL(kLoginURL), &web_view_handle)) {
+  if (!shared_web_view->has_web_view() &&
+      !shared_web_view->Get(GURL(kLoginURL), &web_view_handle)) {
     web_view_handle->web_view()->LoadInitialURL(GURL(kLoginURL));
     InitializeWebView(
         web_view_handle->web_view(),