user_manager: Remove deps on session_manager

chrome/browser/chromeos/login/users/chrome_user_manager_impl.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/users/chrome_user_manager_impl.h"
 
 #include <stddef.h>
 
 #include <cstddef>
 #include <set>
@@ skipping 357 matching lines @@
       } else if (behavior == MultiProfileUserController::kBehaviorPrimaryOnly) {
         NOTREACHED()
             << "Spotted primary-only multi-profile policy for non-primary user";
       }
     }
   }
 
   return unlock_users;
 }
 
-void ChromeUserManagerImpl::SessionStarted() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  ChromeUserManager::SessionStarted();
-
-  content::NotificationService::current()->Notify(
-      chrome::NOTIFICATION_SESSION_STARTED,
-      content::Source<UserManager>(this),
-      content::Details<const user_manager::User>(GetActiveUser()));
-}
-
 void ChromeUserManagerImpl::RemoveUserInternal(
     const AccountId& account_id,
     user_manager::RemoveUserDelegate* delegate) {
   CrosSettings* cros_settings = CrosSettings::Get();
 
   const base::Closure& callback =
       base::Bind(&ChromeUserManagerImpl::RemoveUserInternal,
                  weak_factory_.GetWeakPtr(), account_id, delegate);
 
   // Ensure the value of owner email has been fetched.
@@ skipping 945 matching lines @@
       break;
     default:
       NOTREACHED();
       break;
   }
 
   return user;
 }
 
 }  // namespace chromeos