Mark NPAPIIncognitoTester.PrivateEnabled as flaky on linux

chrome/test/ui/npapi_uitest.cc

 // Copyright (c) 2011 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 "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <comutil.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 295 matching lines @@
 
 TEST_F(NPAPITesterBase, PluginThreadAsyncCall) {
   const FilePath test_case(FILE_PATH_LITERAL("plugin_thread_async_call.html"));
   GURL url = ui_test_utils::GetTestUrl(FilePath(kTestDir), test_case);
   ASSERT_NO_FATAL_FAILURE(NavigateToURL(url));
   WaitForFinish("plugin_thread_async_call", "1", url, kTestCompleteCookie,
                 kTestCompleteSuccess, TestTimeouts::action_max_timeout_ms());
 }
 
 // Test checking the privacy mode is on.
+#if defined(OS_LINUX)
+// http://crbug.com/104380
+#define PrivateEnabled FLAKY_PrivateEnabled
+#endif
 TEST_F(NPAPIIncognitoTester, PrivateEnabled) {
   const FilePath test_case(FILE_PATH_LITERAL("private.html"));
   GURL url = ui_test_utils::GetFileUrlWithQuery(
       ui_test_utils::GetTestFilePath(FilePath(kTestDir), test_case), "private");
   ASSERT_NO_FATAL_FAILURE(NavigateToURL(url));
   WaitForFinish("private", "1", url, kTestCompleteCookie,
                 kTestCompleteSuccess, TestTimeouts::action_max_timeout_ms());
 }
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
@@ skipping 118 matching lines @@
   ASSERT_TRUE(tab->LoadBlockedPlugins());
 
   WaitForFinish("setup", "1", url, kTestCompleteCookie,
                 kTestCompleteSuccess, TestTimeouts::action_max_timeout_ms());
 
   ASSERT_TRUE(tab->ExecuteJavaScript("window.inject()"));
 
   WaitForFinish("setup", "2", url, kTestCompleteCookie,
                 kTestCompleteSuccess, TestTimeouts::action_max_timeout_ms());
 }