Asynchronously load wallpapers when user pod is selected.

chrome/browser/chromeos/chrome_browser_main_chromeos.h

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.h
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.h b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
index 19808108b6a0ce772ab04a3e465cc154b36e27f3..fd3a10492522fb0f613db0289613b14dbe5d1606 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.h
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
@@ -10,7 +10,6 @@
 
 namespace chromeos {
 class BrightnessObserver;
-class DesktopBackgroundObserver;
 class PowerButtonObserver;
 class PowerStateOverride;
 class ResumeObserver;
@@ -44,7 +43,6 @@ class ChromeBrowserMainPartsChromeos : public ChromeBrowserMainPartsLinux {
   scoped_ptr<chromeos::ResumeObserver> resume_observer_;
   scoped_ptr<chromeos::ScreenLockObserver> screen_lock_observer_;
   scoped_ptr<chromeos::SessionManagerObserver> session_manager_observer_;
-  scoped_ptr<chromeos::DesktopBackgroundObserver> desktop_background_observer_;
   scoped_ptr<chromeos::PowerButtonObserver> power_button_observer_;
   scoped_ptr<chromeos::PowerStateOverride> power_state_override_;
   scoped_ptr<chromeos::VideoPropertyWriter> video_property_writer_;