[cros] user_manager component - move UserManagerBase and UserManager

chrome/browser/chromeos/login/users/avatar/user_image_sync_observer.h

Index: chrome/browser/chromeos/login/users/avatar/user_image_sync_observer.h
diff --git a/chrome/browser/chromeos/login/users/avatar/user_image_sync_observer.h b/chrome/browser/chromeos/login/users/avatar/user_image_sync_observer.h
index 503338b41089c0138513122ae304a7681b5e6772..a4c82ca1b2695a5f90e004b384652ef32542158f 100644
--- a/chrome/browser/chromeos/login/users/avatar/user_image_sync_observer.h
+++ b/chrome/browser/chromeos/login/users/avatar/user_image_sync_observer.h
@@ -9,16 +9,13 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
-#include "chrome/browser/chromeos/login/users/user_manager.h"
 #include "chrome/browser/prefs/pref_service_syncable_observer.h"
 #include "content/public/browser/notification_observer.h"
 
 class PrefChangeRegistrar;
 class PrefServiceSyncable;
 class Profile;
-namespace chromeos {
-class User;
-}
+
 namespace content {
 class NotificationRegistrar;
 }
@@ -26,6 +23,10 @@ namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
+namespace user_manager {
+class User;
+}
+
 namespace chromeos {
 
 // This class is responsible for keeping local user image synced with