Mark the flaky iframe post test as such.

chrome_frame/test/chrome_frame_unittests.cc

 // Copyright (c) 2006-2008 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 <windows.h>
 #include <stdarg.h>
 
 // IShellWindows includes.  Unfortunately we can't keep these in
 // alphabetic order since exdisp will bark if some interfaces aren't fully
 // defined.
 #include <mshtml.h>
@@ skipping 452 matching lines @@
 TEST_F(ChromeFrameTestWithWebServer, WidgetModeOpera_CFInstanceZeroSize) {
   OptionalBrowserTest(OPERA, kCFIZeroSizePage, L"CFInstanceZeroSize");
 }
 
 const wchar_t kCFIIfrPostPage[] = L"files/CFInstance_iframe_post_host.html";
 
 TEST_F(ChromeFrameTestWithWebServer, WidgetModeIE_CFInstanceIfrPost) {
   SimpleBrowserTest(IE, kCFIIfrPostPage, L"CFInstanceIfrPost");
 }
 
-TEST_F(ChromeFrameTestWithWebServer, WidgetModeFF_CFInstanceIfrPost) {
+// Flakes out on the bots, http://crbug.com/26372
+TEST_F(ChromeFrameTestWithWebServer,
+       FLAKY_WidgetModeFF_CFInstanceIfrPost) {
   SimpleBrowserTest(FIREFOX, kCFIIfrPostPage, L"CFInstanceIfrPost");
 }
 
 TEST_F(ChromeFrameTestWithWebServer, WidgetModeChrome_CFInstanceIfrPost) {
   OptionalBrowserTest(CHROME, kCFIIfrPostPage, L"CFInstanceIfrPost");
 }
 
 TEST_F(ChromeFrameTestWithWebServer, WidgetModeSafari_CFInstanceIfrPost) {
   OptionalBrowserTest(SAFARI, kCFIIfrPostPage, L"CFInstanceIfrPost");
 }
@@ skipping 1011 matching lines @@
     return;
 
   ASSERT_TRUE(mock.web_browser2() != NULL);
 
   loop.RunFor(kChromeFrameLongNavigationTimeoutInSeconds);
 
   mock.Uninitialize();
   chrome_frame_test::CloseAllIEWindows();
 }