Fix login visual hitch on chromebook

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index 4c143fe2380ce7b70a3cfcb6da64d7a3d8c6f40f..951ec4ecbcc58818e25bd7a7b9a902131f42f943 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -279,9 +279,6 @@ class DBusServices {
     DeviceSettingsService::Get()->Initialize(
         DBusThreadManager::Get()->GetSessionManagerClient(),
         OwnerKeyUtil::Create());
-

[bshe, 2013/01/21 22:53:07]

In order to add CrosSettingsObserver in ctor of WallpaperManager, removing this
is needed. Otherwise, wallpaperManager is created before CrosSettings.

The following code was needed because WallpaperManager was created before
PowerManagerClient. It is not the case now. So I removed this function in
WallpaperManager and add all observers in the ctor of wallpaper manager.

-    // Add observers for WallpaperManager. This depends on PowerManagerClient().
-    WallpaperManager::Get()->AddObservers();
   }
 
   // TODO(stevenjb): Move this into DBusServices() once the switch is no
@@ -733,9 +730,10 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() {
 
   chromeos::MagnificationManager::Shutdown();
 
-  // Let the UserManager unregister itself as an observer of the CrosSettings
-  // singleton before it is destroyed.
+  // Let the UserManager and WallpaperManager unregister itself as an observer
+  // of the CrosSettings singleton before it is destroyed.
   UserManager::Get()->Shutdown();
+  WallpaperManager::Get()->Shutdown();
 
   ChromeBrowserMainPartsLinux::PostMainMessageLoopRun();
 }