Mark flaky tests as flaky:

chrome/browser/login_prompt_uitest.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 <string>
 
 #include "chrome/browser/net/url_fixer_upper.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/automation/tab_proxy.h"
@@ skipping 88 matching lines @@
 
   NavigateTab(tab.get(), server->TestServerPageW(L"auth-digest"));
 
   EXPECT_TRUE(tab->NeedsAuth());
   EXPECT_TRUE(tab->SetAuth(username_digest_, password_));
   EXPECT_EQ(ExpectedTitleFromAuth(username_digest_, password_),
             GetActiveTabTitle());
 }
 
 // Test that logging in on 2 tabs at once works.
-TEST_F(LoginPromptTest, TestTwoAuths) {
+// Flaky, http://crbug.com/25794.
+TEST_F(LoginPromptTest, FLAKY_TestTwoAuths) {
   scoped_refptr<HTTPTestServer> server =
       HTTPTestServer::CreateServer(kDocRoot, NULL);
   ASSERT_TRUE(NULL != server.get());
 
   scoped_refptr<TabProxy> basic_tab(GetActiveTabProxy());
   NavigateTab(basic_tab.get(), server->TestServerPageW(L"auth-basic"));
 
   AppendTab(GURL(chrome::kAboutBlankURL));
   scoped_refptr<TabProxy> digest_tab(GetActiveTabProxy());
   NavigateTab(digest_tab.get(), server->TestServerPageW(L"auth-digest"));
@@ skipping 45 matching lines @@
   EXPECT_TRUE(tab->GoForward());  // should bring us to 'c'
   EXPECT_FALSE(tab->NeedsAuth());
 
   // Now test that cancelling works as expected.
   NavigateTab(tab.get(), server->TestServerPageW(L"auth-basic"));
   EXPECT_TRUE(tab->NeedsAuth());
   EXPECT_TRUE(tab->CancelAuth());
   EXPECT_FALSE(tab->NeedsAuth());
   EXPECT_EQ(L"Denied: no auth", GetActiveTabTitle());
 }