Disabled WebviewLoginTest.BackButton.

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 27 matching lines @@
   content::WindowedNotificationObserver session_start_waiter(
       chrome::NOTIFICATION_SESSION_STARTED,
       content::NotificationService::AllSources());
 
   SetSignFormField("password", OobeBaseTest::kFakeUserPassword);
   ExecuteJsInSigninFrame("document.getElementById('nextButton').click();");
 
   session_start_waiter.Wait();
 }
 
-IN_PROC_BROWSER_TEST_F(WebviewLoginTest, BackButton) {
+// Flaky: http://crbug.com/512648.
+IN_PROC_BROWSER_TEST_F(WebviewLoginTest, DISABLED_BackButton) {
   WaitForGaiaPageLoad();
 
   // Start: no back button, first page.
   JsExpect("$('back-button-item').hidden");
   JsExpect("$('signin-frame').src.indexOf('#identifier') != -1");
 
   // Next step: back button active, second page.
   SetSignFormField("identifier", OobeBaseTest::kFakeUserEmail);
   ExecuteJsInSigninFrame("document.getElementById('nextButton').click();");
   JsExpect("!$('back-button-item').hidden");
@@ skipping 21 matching lines @@
 }
 
 IN_PROC_BROWSER_TEST_F(WebviewLoginTest, AllowGuest) {
   WaitForGaiaPageLoad();
   JsExpect("!$('guest-user-header-bar-item').hidden");
   chromeos::CrosSettings::Get()->SetBoolean(kAccountsPrefAllowGuest, false);
   JsExpect("$('guest-user-header-bar-item').hidden");
 }
 
 }  // namespace chromeos