chromeos: Replace user image notifications with observer

chrome/browser/chromeos/login/users/fake_chrome_user_manager.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/chromeos/login/users/fake_chrome_user_manager.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
@@ skipping 510 matching lines @@
 
 bool FakeChromeUserManager::IsLoggedInAsStub() const {
   return false;
 }
 
 bool FakeChromeUserManager::IsUserNonCryptohomeDataEphemeral(
     const AccountId& account_id) const {
   return false;
 }
 
-void FakeChromeUserManager::AddObserver(UserManager::Observer* obs) {
-  NOTREACHED();
-}
-
-void FakeChromeUserManager::RemoveObserver(UserManager::Observer* obs) {
-  NOTREACHED();
-}
-
-void FakeChromeUserManager::AddSessionStateObserver(
-    UserManager::UserSessionStateObserver* obs) {}
-
-void FakeChromeUserManager::RemoveSessionStateObserver(
-    UserManager::UserSessionStateObserver* obs) {}
-
-void FakeChromeUserManager::NotifyLocalStateChanged() {
-  NOTREACHED();
-}
-
 void FakeChromeUserManager::ChangeUserChildStatus(user_manager::User* user,
                                                   bool is_child) {
   NOTREACHED();
 }
 
 bool FakeChromeUserManager::AreSupervisedUsersAllowed() const {
   return true;
 }
 
 PrefService* FakeChromeUserManager::GetLocalState() const {
@@ skipping 85 matching lines @@
   if (active_account_id_.is_valid()) {
     for (const auto& user : users_) {
       if (user->GetAccountId() == active_account_id_)
         return user;
     }
   }
   return users_[0];
 }
 
 }  // namespace chromeos