cros: Fix WebviewLoginTest.Basic multiple login attempts.

chrome/browser/chromeos/login/webview_login_browsertest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/login/test/oobe_base_test.h"
 #include "chrome/browser/chromeos/login/ui/webui_login_display.h"
 #include "chromeos/chromeos_switches.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/test_utils.h"
@@ skipping 28 matching lines @@
 
     ASSERT_TRUE(content::ExecuteScript(
         GetLoginUI()->GetWebContents(),
         "$('gaia-signin').gaiaAuthHost_.addEventListener('ready',"
           "function() {"
             "window.domAutomationController.setAutomationId(0);"
             "window.domAutomationController.send('GaiaReady');"
           "});"));
 
     content::DOMMessageQueue message_queue;
-    GetLoginDisplay()->ShowSigninScreenForCreds("", "");
-
     std::string message;
     ASSERT_TRUE(message_queue.WaitForMessage(&message));
     EXPECT_EQ("\"GaiaReady\"", message);
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebviewLoginTest);
 };
 
 IN_PROC_BROWSER_TEST_F(WebviewLoginTest, Basic) {
@@ skipping 10 matching lines @@
       chrome::NOTIFICATION_SESSION_STARTED,
       content::NotificationService::AllSources());
 
   SetSignFormField("password", kFakeUserPassword);
   ExecuteJsInSigninFrame("document.getElementById('nextButton').click();");
 
   session_start_waiter.Wait();
 }
 
 }  // namespace chromeos