Disable a flaky test.

chrome/browser/extensions/plugin_apitest.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 "chrome/browser/content_settings/host_content_settings_map.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/test/browser_test_utils.h"
 #include "net/base/net_util.h"
 
 using content::NavigationController;
 using content::WebContents;
 using extensions::Extension;
 
+#if defined(OS_WIN) && !defined(NDEBUG)
+// http://crbug.com/123851 : test flakily fails on win debug.
+#define MAYBE_PluginLoadUnload DISABLED_PluginLoadUnload
+#else
+#define MAYBE_PluginLoadUnload PluginLoadUnload
+#endif
+
 // Tests that a renderer's plugin list is properly updated when we load and
 // unload an extension that contains a plugin.
-IN_PROC_BROWSER_TEST_F(ExtensionBrowserTest, PluginLoadUnload) {
+IN_PROC_BROWSER_TEST_F(ExtensionBrowserTest, MAYBE_PluginLoadUnload) {
   browser()->profile()->GetPrefs()->SetBoolean(prefs::kPluginsAlwaysAuthorize,
                                                true);
 
   FilePath extension_dir =
       test_data_dir_.AppendASCII("uitest").AppendASCII("plugins");
 
   ui_test_utils::NavigateToURL(browser(),
       net::FilePathToFileURL(extension_dir.AppendASCII("test.html")));
   WebContents* tab = chrome::GetActiveWebContents(browser());
 
@@ skipping 96 matching lines @@
   EXPECT_TRUE(result);
 #endif
 
   // Now load it through a file URL. The plugin should not load.
   ui_test_utils::NavigateToURL(browser(),
       net::FilePathToFileURL(extension_dir.AppendASCII("test.html")));
   ASSERT_TRUE(content::ExecuteJavaScriptAndExtractBool(
       tab->GetRenderViewHost(), L"", L"testPluginWorks()", &result));
   EXPECT_FALSE(result);
 }