Mark a test as flaky on ChromeOS.

chrome/browser/extensions/extension_infobar_apitest.cc

 // Copyright (c) 2010 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/extensions/extension_apitest.h"
 #include "chrome/common/chrome_switches.h"
 
 #if defined(TOOLKIT_VIEWS)
+#if defined (OS_WIN)
+#define MAYBE_Infobars Infobars
+#else
+// Flaky on ChromeOS, see http://crbug.com/40141.
+#define MAYBE_Infobars FLAKY_Infobars
+#endif
+
+#else
 // Need to port ExtensionInfoBarDelegate::CreateInfoBar() to other platforms.
 // See http://crbug.com/39916 for details.
-#define MAYBE_Infobars Infobars
-#else
 #define MAYBE_Infobars DISABLED_Infobars
 #endif
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, MAYBE_Infobars) {
   // TODO(finnur): Remove once infobars are no longer experimental (bug 39511).
   CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableExperimentalExtensionApis);
 
   ASSERT_TRUE(RunExtensionTest("infobars")) << message_;
 }