This CL replaces user_manager::UserID with AccountId.

chrome/browser/chromeos/login/supervised/supervised_user_creation_screen.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/supervised/supervised_user_creation_screen.h"
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/shell.h"
 #include "base/rand_util.h"
 #include "base/values.h"
@@ skipping 205 matching lines @@
 }
 
 void SupervisedUserCreationScreen::AuthenticateManager(
     const std::string& manager_id,
     const std::string& manager_password) {
   if (manager_signin_in_progress_)
     return;
   manager_signin_in_progress_ = true;
 
   UserFlow* flow = new SupervisedUserCreationFlow(manager_id);
-  ChromeUserManager::Get()->SetUserFlow(manager_id, flow);
+  ChromeUserManager::Get()->SetUserFlow(AccountId::FromUserEmail(manager_id),
+                                        flow);
 
   // Make sure no two controllers exist at the same time.
   controller_.reset();
 
   controller_.reset(new SupervisedUserCreationControllerNew(this, manager_id));
 
-  UserContext user_context(manager_id);
+  UserContext user_context(AccountId::FromUserEmail(manager_id));
   user_context.SetKey(Key(manager_password));
   ExistingUserController::current_controller()->Login(user_context,
                                                       SigninSpecifics());
 }
 
 void SupervisedUserCreationScreen::CreateSupervisedUser(
     const base::string16& display_name,
     const std::string& supervised_user_password) {
   DCHECK(controller_.get());
   int image;
@@ skipping 233 matching lines @@
   }
   return false;
 }
 
 // TODO(antrim) : this is an explicit code duplications with UserImageScreen.
 // It should be removed by issue 251179.
 
 void SupervisedUserCreationScreen::ApplyPicture() {
   std::string user_id = controller_->GetSupervisedUserId();
   UserImageManager* image_manager =
-      ChromeUserManager::Get()->GetUserImageManager(user_id);
+      ChromeUserManager::Get()->GetUserImageManager(
+          AccountId::FromUserEmail(user_id));
   switch (selected_image_) {
     case user_manager::User::USER_IMAGE_EXTERNAL:
       // Photo decoding may not have been finished yet.
       if (user_photo_.isNull()) {
         apply_photo_after_decoding_ = true;
         return;
       }
       image_manager->SaveUserImage(
           user_manager::UserImage::CreateAndEncode(user_photo_));
       break;
@@ skipping 124 matching lines @@
     selected_image_ = user_manager::User::USER_IMAGE_EXTERNAL;
   } else {
     NOTREACHED() << "Unexpected image type: " << image_type;
   }
 }
 
 void SupervisedUserCreationScreen::OnImageAccepted() {
 }
 
 }  // namespace chromeos