Fix interstitial ui crashing when open in new tab.

chrome/browser/ui/webui/interstitials/interstitial_ui_browsertest.cc

 // Copyright 2014 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 "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/devtools/devtools_window_testing.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ skipping 14 matching lines @@
       browser()->tab_strip_model()->GetActiveWebContents()->GetTitle());
 
     // Should also be able to open and close devtools.
     DevToolsWindow* window =
         DevToolsWindowTesting::OpenDevToolsWindowSync(browser(), true);
     EXPECT_TRUE(window);
     DevToolsWindowTesting::CloseDevToolsWindowSync(window);
   }
 };
 
+// The following test is disabled due to flakiness:
+// https://crbug.com/405869,
+// https://crbug.com/400503.
 IN_PROC_BROWSER_TEST_F(InterstitialUITest, DISABLED_OpenInterstitial) {
   TestInterstitial(
       GURL("chrome://interstitials"),
       "Interstitials");
   // Invalid path should open the main page:
   TestInterstitial(
       GURL("chrome://interstitials/--invalid--"),
       "Interstitials");
   TestInterstitial(
       GURL("chrome://interstitials/ssl"),
       "Privacy error");
   TestInterstitial(
       GURL("chrome://interstitials/safebrowsing?type=malware"),
       "Security error");
   TestInterstitial(
       GURL("chrome://interstitials/safebrowsing?type=phishing"),
       "Security error");
   TestInterstitial(
       GURL("chrome://interstitials/safebrowsing?type=clientside_malware"),
       "Security error");
   TestInterstitial(
       GURL("chrome://interstitials/safebrowsing?type=clientside_phishing"),
       "Security error");
   TestInterstitial(GURL("chrome://interstitials/captiveportal"),
                    "Connect to network");
   TestInterstitial(GURL("chrome://interstitials/captiveportal?is_wifi=1"),
                    "Connect to Wi-Fi");
 }