Fix login visual hitch on chromebook

chrome/browser/chromeos/login/user_manager_impl.cc

Index: chrome/browser/chromeos/login/user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/user_manager_impl.cc b/chrome/browser/chromeos/login/user_manager_impl.cc
index 8830cd2a0575247b1c12b91b57db65ce81a761e2..173bbe2eab8bf5faed091493596943e0542d7431 100644
--- a/chrome/browser/chromeos/login/user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/user_manager_impl.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2013 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.
 
@@ -189,6 +189,9 @@ UserManagerImpl::~UserManagerImpl() {
     delete *it;
   }
   delete logged_in_user_;
+
+  // Use singleton UserManagerImpl to manage the lifetime of WallpaperManager.
+  delete WallpaperManager::Get();

[bshe, 2013/01/23 16:08:34]

It looks this cause some browser tests failing(DCHECK fail, some browser tests
didn't add/remove observers). The life time of wallpaper manager need more
careful thought. I am removing it here and added a TODO.

 }
 
 void UserManagerImpl::Shutdown() {