The User Manager should be backed by a special profile, not the guest one.

chrome/browser/ui/cocoa/profiles/user_manager_mac_unittest.mm

 // Copyright 2014 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/ui/cocoa/profiles/user_manager_mac.h"
 
 #include "base/run_loop.h"
+#include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/profiles/profile_window.h"
 #include "chrome/test/base/browser_with_test_window_test.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "chrome/test/base/testing_profile_manager.h"
 
 class UserManagerMacTest : public BrowserWithTestWindowTest {
  public:
   UserManagerMacTest()
       : testing_profile_manager_(TestingBrowserProcess::GetGlobal()) {
   }
 
   virtual void SetUp() OVERRIDE {
     BrowserWithTestWindowTest::SetUp();
     ASSERT_TRUE(testing_profile_manager_.SetUp());
-    // Pre-load the guest profile so we don't have to wait for the User Manager
-    // to asynchronously create it.
-    testing_profile_manager_.CreateGuestProfile();
+    // Pre-load the special profile so we don't have to wait for the
+    // User Manager to asynchronously create it.
+    testing_profile_manager_.CreateUserManagerProfile();
   }
 
   virtual void TearDown() OVERRIDE {
-    testing_profile_manager_.DeleteGuestProfile();
+    testing_profile_manager_.DeleteProfileWithPath(
+        ProfileManager::GetUserManagerProfilePath());
     TestingBrowserProcess::GetGlobal()->SetProfileManager(NULL);
     base::RunLoop().RunUntilIdle();
     BrowserWithTestWindowTest::TearDown();
   }
 
  private:
   TestingProfileManager testing_profile_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(UserManagerMacTest);
 };
 
 TEST_F(UserManagerMacTest, ShowUserManager) {
   EXPECT_FALSE(UserManagerMac::IsShowing());
   UserManagerMac::Show(base::FilePath(), profiles::USER_MANAGER_NO_TUTORIAL);
   EXPECT_TRUE(UserManagerMac::IsShowing());
 
   UserManagerMac::Hide();
   EXPECT_FALSE(UserManagerMac::IsShowing());
 }