Fixes race condition that could lead to premature shutdown. When

chrome/browser/chromeos/tab_closeable_state_watcher_browsertest.cc

 // Copyright (c) 2011 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/chromeos/tab_closeable_state_watcher.h"
 
 #include "base/file_path.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/app_modal_dialogs/app_modal_dialog.h"
@@ skipping 229 matching lines @@
   // Close incognito browser.
   incognito_browser->CloseWindow();
   ui_test_utils::RunAllPendingInMessageLoop();
   EXPECT_EQ(1u, BrowserList::size());
   EXPECT_EQ(browser(), *(BrowserList::begin()));
   EXPECT_FALSE(CanCloseTab(browser()));
 }
 
 // Tests closing an incognito browser - the incognito browser should close,
 // and a new normal browser opened with a NewTabPage (which is not closeable).
-// Test is flaky:
-// EXPECT_EQ(1u, BrowserList::size()) in the "Close incognito browser." block
-// currently fails in ~13% of all runs. See http://crbug.com/83861
-IN_PROC_BROWSER_TEST_F(TabCloseableStateWatcherTest,
-                       FLAKY_CloseIncognitoBrowser) {
+IN_PROC_BROWSER_TEST_F(TabCloseableStateWatcherTest, CloseIncognitoBrowser) {
   NavigateToURL(ntp_url_);
 
   // Open an incognito browser.
   Browser* incognito_browser = CreateIncognitoBrowser();
   EXPECT_TRUE(incognito_browser->profile()->IsOffTheRecord());
   EXPECT_EQ(2u, BrowserList::size());
 
   // Close 1st normal browser.
   browser()->CloseWindow();
   ui_test_utils::RunAllPendingInMessageLoop();
@@ skipping 52 matching lines @@
   AppModalDialog* confirm = ui_test_utils::WaitForAppModalDialog();
   confirm->native_dialog()->AcceptAppModalDialog();
   NewTabObserver new_tab_observer(browser());
   EXPECT_EQ(1u, BrowserList::size());
   EXPECT_EQ(browser(), *(BrowserList::begin()));
   EXPECT_EQ(1, browser()->tab_count());
   EXPECT_EQ(ntp_url_, browser()->GetSelectedTabContents()->GetURL());
 }
 
 }  // namespace chromeos