Mark test UnloadTest.BrowserCloseUnload as flaky.

chrome/browser/unload_uitest.cc

 // Copyright (c) 2006-2009 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 "app/message_box_flags.h"
 #include "base/file_util.h"
 #include "base/platform_thread.h"
 #include "chrome/browser/net/url_request_mock_http_job.h"
 #include "chrome/browser/view_ids.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 265 matching lines @@
   NavigateToNolistenersFileTwice();
   ASSERT_TRUE(IsBrowserRunning());
 }
 
 // Tests closing the browser on a page with no unload listeners registered.
 TEST_F(UnloadTest, SKIP_LINUX(BrowserCloseNoUnloadListeners)) {
   LoadUrlAndQuitBrowser(NOLISTENERS_HTML, L"nolisteners");
 }
 
 // Tests closing the browser on a page with an unload listener registered.
-TEST_F(UnloadTest, SKIP_LINUX(BrowserCloseUnload)) {
+// Test marked as flaky in http://crbug.com/51698
+TEST_F(UnloadTest, SKIP_LINUX(FLAKY_BrowserCloseUnload)) {
   LoadUrlAndQuitBrowser(UNLOAD_HTML, L"unload");
 }
 
 // Tests closing the browser with a beforeunload handler and clicking
 // OK in the beforeunload confirm dialog.
 TEST_F(UnloadTest, BrowserCloseBeforeUnloadOK) {
   scoped_refptr<BrowserProxy> browser(automation()->GetBrowserWindow(0));
   ASSERT_TRUE(browser.get());
   NavigateToDataURL(BEFORE_UNLOAD_HTML, L"beforeunload");
 
@@ skipping 147 matching lines @@
   ASSERT_TRUE(browser->WaitForTabCountToBecome(1, action_timeout_ms()));
   scoped_refptr<TabProxy> main_tab(browser->GetActiveTab());
   ASSERT_TRUE(main_tab.get());
   std::wstring main_title;
   EXPECT_TRUE(main_tab->GetTabTitle(&main_title));
   EXPECT_EQ(std::wstring(L"only_one_unload"), main_title);
 }
 
 // TODO(ojan): Add tests for unload/beforeunload that have multiple tabs
 // and multiple windows.