Mark GuestModeOptionsBrowserTest.LoadOptionsByURL as flaky.

chrome/browser/ui/webui/options/chromeos/guest_mode_options_ui_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 "base/command_line.h"
 #include "chrome/browser/ui/webui/options/options_ui_browsertest.h"
 #include "chrome/common/chrome_switches.h"
 
 namespace {
 
 // Same as OptionsBrowserTest but launches with Guest mode command line
 // switches.
 class GuestModeOptionsBrowserTest : public options::OptionsBrowserTest {
  public:
    GuestModeOptionsBrowserTest() : OptionsBrowserTest() {}
 
    virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     command_line->AppendSwitch(switches::kGuestSession);
     command_line->AppendSwitch(switches::kIncognito);
   }
 };
 
-IN_PROC_BROWSER_TEST_F(GuestModeOptionsBrowserTest, LoadOptionsByURL) {
+IN_PROC_BROWSER_TEST_F(GuestModeOptionsBrowserTest, FLAKY_LoadOptionsByURL) {
   NavigateToSettings();
   VerifyTitle();
   VerifyNavbar();
 }
 
 }  // namespace