Remove unused stub_user_accounts_delegate.*

chrome/browser/ui/ash/stub_user_accounts_delegate.h

-// 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.
-
-#ifndef CHROME_BROWSER_UI_ASH_STUB_USER_ACCOUNTS_DELEGATE_H_
-#define CHROME_BROWSER_UI_ASH_STUB_USER_ACCOUNTS_DELEGATE_H_
-
-#include "ash/system/user/user_accounts_delegate.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-
-class StubUserAccountsDelegate : public ash::tray::UserAccountsDelegate {
- public:
-  explicit StubUserAccountsDelegate(const std::string& owner_id);
-  virtual ~StubUserAccountsDelegate();
-
-  void AddAccount(const std::string& account);
-
-  // Overridden from ash::tray::UserAccountsDelegate:
-  virtual std::string GetPrimaryAccountId() override;
-  virtual std::vector<std::string> GetSecondaryAccountIds() override;
-  virtual std::string GetAccountDisplayName(const std::string& account_id)
-      override;
-  virtual void DeleteAccount(const std::string& account_id) override;
-  virtual void LaunchAddAccountDialog() override;
-
- private:
-  std::string primary_account_;
-  std::vector<std::string> secondary_accounts_;
-
-  DISALLOW_COPY_AND_ASSIGN(StubUserAccountsDelegate);
-};
-
-#endif  // CHROME_BROWSER_UI_ASH_STUB_USER_ACCOUNTS_DELEGATE_H_