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

chrome/test/base/testing_profile_manager.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/test/base/testing_profile_manager.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_special_storage_policy.h"
 #include "chrome/browser/prefs/pref_service_syncable.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 const std::string kGuestProfileName = "Guest";
+const std::string kUserManagerProfileName = "UserManager";
 
 namespace testing {
 
 class ProfileManager : public ::ProfileManagerWithoutInit {
  public:
   explicit ProfileManager(const base::FilePath& user_data_dir)
       : ::ProfileManagerWithoutInit(user_data_dir) {}
 
  protected:
   virtual Profile* CreateProfileHelper(
@@ skipping 91 matching lines @@
   otr_profile->SetOriginalProfile(profile);
   profile->SetOffTheRecordProfile(otr_profile.PassAs<Profile>());
   profile_manager_->AddProfile(profile);  // Takes ownership.
   profile_manager_->SetGuestProfilePrefs(profile);
 
   testing_profiles_.insert(std::make_pair(kGuestProfileName, profile));
 
   return profile;
 }
 
+TestingProfile* TestingProfileManager::CreateUserManagerProfile() {
+  DCHECK(called_set_up_);
+
+  // Create the profile and register it.
+  TestingProfile::Builder builder;
+  builder.SetGuestSession();
+  builder.SetPath(ProfileManager::GetUserManagerProfilePath());
+
+  // Add the profile to the profile manager, but not to the info cache.
+  TestingProfile* profile = builder.Build().release();
+  profile->set_profile_name(kUserManagerProfileName);
+  profile_manager_->AddProfile(profile);  // Takes ownership.
+  testing_profiles_.insert(std::make_pair(kUserManagerProfileName, profile));
+
+  return profile;
+}
+
 void TestingProfileManager::DeleteTestingProfile(const std::string& name) {
   DCHECK(called_set_up_);
 
   TestingProfilesMap::iterator it = testing_profiles_.find(name);
   DCHECK(it != testing_profiles_.end());
-
   TestingProfile* profile = it->second;
 
-  ProfileInfoCache& cache = profile_manager_->GetProfileInfoCache();
-  cache.DeleteProfileFromCache(profile->GetPath());
-
-  profile_manager_->profiles_info_.erase(profile->GetPath());
+  DeleteProfileWithPath(profile->GetPath());
 }
 
-void TestingProfileManager::DeleteGuestProfile() {
+void TestingProfileManager::DeleteProfileWithPath(const base::FilePath& path) {
   DCHECK(called_set_up_);
 
-  TestingProfilesMap::iterator it = testing_profiles_.find(kGuestProfileName);
-  DCHECK(it != testing_profiles_.end());
+  ProfileInfoCache& cache = profile_manager_->GetProfileInfoCache();
+  if (cache.GetIndexOfProfileWithPath(path) != std::string::npos) {
+    cache.DeleteProfileFromCache(path);
+  }
 
-  profile_manager_->profiles_info_.erase(ProfileManager::GetGuestProfilePath());
+  profile_manager_->profiles_info_.erase(path);
 }
 
 void TestingProfileManager::DeleteProfileInfoCache() {
   profile_manager_->profile_info_cache_.reset(NULL);
 }
 
 void TestingProfileManager::SetLoggedIn(bool logged_in) {
   profile_manager_->logged_in_ = logged_in;
 }
 
@@ skipping 17 matching lines @@
       << "ProfileManager already exists";
 
   // Set up the directory for profiles.
   ASSERT_TRUE(profiles_dir_.CreateUniqueTempDir());
 
   profile_manager_ = new testing::ProfileManager(profiles_dir_.path());
   browser_process_->SetProfileManager(profile_manager_);  // Takes ownership.
 
   called_set_up_ = true;
 }