Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/chromeos/login/user_manager_unittest.cc

Index: chrome/browser/chromeos/login/user_manager_unittest.cc
diff --git a/chrome/browser/chromeos/login/user_manager_unittest.cc b/chrome/browser/chromeos/login/user_manager_unittest.cc
index 475ad119ae391ce26da42b91e490cbf6ce95b67a..325f225903fe67be1c211f4f76a7d7179b999d5c 100644
--- a/chrome/browser/chromeos/login/user_manager_unittest.cc
+++ b/chrome/browser/chromeos/login/user_manager_unittest.cc
@@ -60,11 +60,11 @@ class UserManagerTest : public testing::Test {
     local_state_.reset(new TestingPrefServiceSimple);
     reinterpret_cast<TestingBrowserProcess*>(g_browser_process)
         ->SetLocalState(local_state_.get());
-    UserManager::RegisterPrefs(local_state_.get());
+    UserManager::RegisterPrefs(local_state_->registry());
     // Wallpaper manager and user image managers prefs will be accessed by the
     // unit-test as well.
-    UserImageManager::RegisterPrefs(local_state_.get());
-    WallpaperManager::RegisterPrefs(local_state_.get());
+    UserImageManager::RegisterPrefs(local_state_->registry());
+    WallpaperManager::RegisterPrefs(local_state_->registry());
 
     old_user_manager_ = UserManager::Get();
     ResetUserManager();