sessions: disable ContinueWhereILeftOffTest on Mac

chrome/browser/sessions/better_session_restore_browsertest.cc

 // Copyright (c) 2012 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 <stddef.h>
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 576 matching lines @@
 
 IN_PROC_BROWSER_TEST_F(ContinueWhereILeftOffTest,
                        PostWithPasswordBrowserClose) {
   PostFormWithPage("post_with_password.html", true);
   Browser* new_browser = QuitBrowserAndRestore(browser(), false);
   CheckReloadedPageRestored(new_browser);
   // The form data contained passwords, so it's removed completely.
   CheckFormRestored(new_browser, false, false);
 }
 
+// Flaky on Mac: https://crbug.com/709504
+#if defined(OS_MACOSX)
+#define MAYBE_SessionCookiesCloseAllBrowsers \
+  DISABLED_SessionCookiesCloseAllBrowsers
+#else
+#define MAYBE_SessionCookiesCloseAllBrowsers SessionCookiesCloseAllBrowsers
+#endif
 // Check that session cookies are cleared on a wrench menu quit.
 IN_PROC_BROWSER_TEST_F(ContinueWhereILeftOffTest,
-                       SessionCookiesCloseAllBrowsers) {
+                       MAYBE_SessionCookiesCloseAllBrowsers) {
   // Set the startup preference to "continue where I left off" and visit a page
   // which stores a session cookie.
   StoreDataWithPage("session_cookies.html");
   Browser* new_browser = QuitBrowserAndRestore(browser(), true);
   // The browsing session will be continued; just wait for the page to reload
   // and check the stored data.
   CheckReloadedPageRestored(new_browser);
 }
 
 // Check that cookies are cleared on a wrench menu quit only if cookies are set
@@ skipping 286 matching lines @@
   CookieSettingsFactory::GetForProfile(new_browser->profile())
       ->SetDefaultCookieSetting(CONTENT_SETTING_SESSION_ONLY);
   // ... even if background mode is active.
   EnableBackgroundMode();
   new_browser = QuitBrowserAndRestore(new_browser, true);
   StoreDataWithPage(new_browser, "cookies.html");
   DisableBackgroundMode();
   new_browser = QuitBrowserAndRestore(new_browser, true);
   StoreDataWithPage(new_browser, "cookies.html");
 }