[cros] Move User class to user_manager component.

chrome/browser/notifications/message_center_settings_controller.cc

Index: chrome/browser/notifications/message_center_settings_controller.cc
diff --git a/chrome/browser/notifications/message_center_settings_controller.cc b/chrome/browser/notifications/message_center_settings_controller.cc
index 1278631549abd3b352e4b876e1450e06b3474bc9..7d03bd6fc017d6c0ff674c1c88b135e06a74a757 100644
--- a/chrome/browser/notifications/message_center_settings_controller.cc
+++ b/chrome/browser/notifications/message_center_settings_controller.cc
@@ -411,7 +411,7 @@ void MessageCenterSettingsController::OnFaviconLoaded(
 
 #if defined(OS_CHROMEOS)
 void MessageCenterSettingsController::ActiveUserChanged(
-    const chromeos::User* active_user) {
+    const user_manager::User* active_user) {
   RebuildNotifierGroups();
 }
 #endif
@@ -452,7 +452,7 @@ void MessageCenterSettingsController::CreateNotifierGroupForGuestLogin() {
   if (!user_manager->IsLoggedInAsGuest())
     return;
 
-  chromeos::User* user = user_manager->GetActiveUser();
+  user_manager::User* user = user_manager->GetActiveUser();
   Profile* profile = chromeos::ProfileHelper::Get()->GetProfileByUser(user);
   DCHECK(profile);
   notifier_groups_.push_back(