Groom user manager's code.

components/user_manager/user_manager_base.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 "components/user_manager/user_manager_base.h"
 
 #include <cstddef>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 777 matching lines @@
 
 const User* UserManagerBase::FindUserInList(const std::string& user_id) const {
   const UserList& users = GetUsers();
   for (UserList::const_iterator it = users.begin(); it != users.end(); ++it) {
     if ((*it)->email() == user_id)
       return *it;
   }
   return NULL;
 }
 
-const bool UserManagerBase::UserExistsInList(const std::string& user_id) const {
+bool UserManagerBase::UserExistsInList(const std::string& user_id) const {
   const base::ListValue* user_list = GetLocalState()->GetList(kRegularUsers);
   for (size_t i = 0; i < user_list->GetSize(); ++i) {
     std::string email;
     if (user_list->GetString(i, &email) && (user_id == email))
       return true;
   }
   return false;
 }
 
 User* UserManagerBase::FindUserInListAndModify(const std::string& user_id) {
@@ skipping 245 matching lines @@
 }
 
 void UserManagerBase::DeleteUser(User* user) {
   const bool is_active_user = (user == active_user_);
   delete user;
   if (is_active_user)
     active_user_ = NULL;
 }
 
 }  // namespace user_manager