Remove Chromecast extension support from cast system tray menu.

chrome/browser/ui/ash/cast_config_delegate_chromeos.h

-// Copyright 2015 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_CAST_CONFIG_DELEGATE_CHROMEOS_H_
-#define CHROME_BROWSER_UI_ASH_CAST_CONFIG_DELEGATE_CHROMEOS_H_
-
-#include <string>
-
-#include "ash/common/cast_config_delegate.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/values.h"
-
-namespace chromeos {
-
-// A class which allows the ash tray to communicate with the cast extension.
-class CastConfigDelegateChromeos : public ash::CastConfigDelegate {
- public:
-  CastConfigDelegateChromeos();
-  ~CastConfigDelegateChromeos() override;
-
- private:
-  // CastConfigDelegate:
-  bool HasCastExtension() const override;
-  void RequestDeviceRefresh() override;
-  void CastToReceiver(const std::string& receiver_id) override;
-  void StopCasting(const std::string& activity_id) override;
-  bool HasOptions() const override;
-  void LaunchCastOptions() override;
-  void AddObserver(ash::CastConfigDelegate::Observer* observer) override;
-  void RemoveObserver(ash::CastConfigDelegate::Observer* observer) override;
-
-  DISALLOW_COPY_AND_ASSIGN(CastConfigDelegateChromeos);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_UI_ASH_CAST_CONFIG_DELEGATE_CHROMEOS_H_