chromeos: Replace user image notifications with observer

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

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_USERS_AVATAR_USER_IMAGE_MANAGER_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USERS_AVATAR_USER_IMAGE_MANAGER_IMPL_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 118 matching lines @@
   // with download times).
   void DownloadProfileData(const std::string& reason);
 
   // Removes ther user from the dictionary |prefs_dict_root| in
   // local state and deletes the image file that the dictionary
   // referenced for that user.
   void DeleteUserImageAndLocalStateEntry(const char* prefs_dict_root);
 
   // Called when a Job updates the copy of the user image held in
   // memory.  Allows |this| to update |downloaded_profile_image_| and
-  // send a NOTIFICATION_LOGIN_USER_IMAGE_CHANGED notification.
+  // notify user manager about user image change.
   void OnJobChangedUserImage();
 
   // Called when a Job for the user finishes.
   void OnJobDone();
 
   // Create a sync observer if a user is logged in, the user's user image is
   // allowed to be synced and no sync observer exists yet.
   void TryToCreateImageSyncObserver();
 
   // Returns immutable version of user with |user_id_|.
@@ skipping 64 matching lines @@
   bool has_managed_image_;
 
   base::WeakPtrFactory<UserImageManagerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UserImageManagerImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USERS_AVATAR_USER_IMAGE_MANAGER_IMPL_H_