Add test to check for crash caused by stale WebContents in chrome://interstitials

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

Index: chrome/browser/ui/webui/interstitials/interstitial_ui_browsertest.cc
diff --git a/chrome/browser/ui/webui/interstitials/interstitial_ui_browsertest.cc b/chrome/browser/ui/webui/interstitials/interstitial_ui_browsertest.cc
index eba2e016f8c97bd1b4b759b9f6dc9c56c5b4a234..758921907e04ec4a26dc37b02c0f089dc2cc4399 100644
--- a/chrome/browser/ui/webui/interstitials/interstitial_ui_browsertest.cc
+++ b/chrome/browser/ui/webui/interstitials/interstitial_ui_browsertest.cc
@@ -7,6 +7,7 @@
 #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/browser_commands.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
@@ -84,3 +85,20 @@ IN_PROC_BROWSER_TEST_F(InterstitialUITest, CaptivePortalInterstitialWifi) {
   TestInterstitial(GURL("chrome://interstitials/captiveportal?is_wifi=1"),
                    "Connect to Wi-Fi");
 }
+
+// Checks that the interstitial page uses correct web contents. If not, closing
+// the tab might result in a freed web contents pointer and cause a crash.
+// See https://crbug.com/611706 for details.
+IN_PROC_BROWSER_TEST_F(InterstitialUITest, UseCorrectWebContents) {
+  int current_tab = browser()->tab_strip_model()->active_index();
+  ui_test_utils::NavigateToURL(browser(), GURL("chrome://interstitials/ssl"));
+
+  // Duplicate the tab and close it.
+  chrome::DuplicateTab(browser());
+  EXPECT_NE(current_tab, browser()->tab_strip_model()->active_index());
+  chrome::CloseTab(browser());
+  EXPECT_EQ(current_tab, browser()->tab_strip_model()->active_index());
+
+  // Reloading the page shouldn't cause a crash.
+  chrome::Reload(browser(), WindowOpenDisposition::CURRENT_TAB);
+}