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

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

Index: chrome/browser/ui/cocoa/profiles/user_manager_mac_unittest.mm
diff --git a/chrome/browser/ui/cocoa/profiles/user_manager_mac_unittest.mm b/chrome/browser/ui/cocoa/profiles/user_manager_mac_unittest.mm
index aab68ea55ceea6089350425a7a48ab959d9fe012..9413087ae0d6ed793244ad5e6f556128719850a5 100644
--- a/chrome/browser/ui/cocoa/profiles/user_manager_mac_unittest.mm
+++ b/chrome/browser/ui/cocoa/profiles/user_manager_mac_unittest.mm
@@ -5,6 +5,7 @@
 #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"
@@ -19,13 +20,14 @@ class UserManagerMacTest : public BrowserWithTestWindowTest {
   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();