Add comment about flaky test.

chrome/browser/browser_browsertest.cc

 // Copyright (c) 2009 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 <string>
 
 #include "app/l10n_util.h"
 #include "base/sys_info.h"
 #include "chrome/app/chrome_dll_resource.h"
 #include "chrome/browser/app_modal_dialog.h"
@@ skipping 225 matching lines @@
   alert->CloseModalDialog();
   EXPECT_FALSE(browser()->GetSelectedTabContents()->is_loading());
 
   // Clear the beforeunload handler so the test can easily exit.
   browser()->GetSelectedTabContents()->render_view_host()->
       ExecuteJavascriptInWebFrame(L"", L"onbeforeunload=null;");
 }
 
 // Test for crbug.com/11647.  A page closed with window.close() should not have
 // two beforeunload dialogs shown.
+// Flaky: see http://crbug.com/27039
 IN_PROC_BROWSER_TEST_F(BrowserTest, FLAKY_SingleBeforeUnloadAfterWindowClose) {
   browser()->GetSelectedTabContents()->render_view_host()->
       ExecuteJavascriptInWebFrame(L"", OPEN_NEW_BEFOREUNLOAD_PAGE);
 
   // Close the new window with JavaScript, which should show a single
   // beforeunload dialog.  Then show another alert, to make it easy to verify
   // that a second beforeunload dialog isn't shown.
   browser()->GetTabContentsAt(0)->render_view_host()->
       ExecuteJavascriptInWebFrame(L"", L"w.close(); alert('bar');");
   AppModalDialog* alert = ui_test_utils::WaitForAppModalDialog();
@@ skipping 186 matching lines @@
   EXPECT_EQ("en", current_tab->language_state().original_language());
 
   // Now navigate to a page in French.
   ui_test_utils::NavigateToURL(
       browser(), GURL(server->TestServerPage("files/french_page.html")));
   EXPECT_TRUE(current_tab->language_state().original_language().empty());
   lang = ui_test_utils::WaitForLanguageDetection(current_tab);
   EXPECT_EQ("fr", lang);
   EXPECT_EQ("fr", current_tab->language_state().original_language());
 }