media: Simplify MediaPermissionDispatcher.

content/renderer/media/media_permission_dispatcher_proxy.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.
-
-// A helper class to forward the calls to MediaPermissionDispatcherImpl on UI
-// thread and have the permission status callback on the caller's original
-// non-UI thread.
-
-#ifndef CONTENT_RENDERER_MEDIA_MEDIA_PERMISSION_PROXY_H_
-#define CONTENT_RENDERER_MEDIA_MEDIA_PERMISSION_PROXY_H_
-
-#include "base/memory/weak_ptr.h"
-#include "base/single_thread_task_runner.h"
-#include "content/common/content_export.h"
-#include "content/renderer/media/media_permission_dispatcher.h"
-#include "media/base/media_permission.h"
-
-namespace content {
-
-class CONTENT_EXPORT MediaPermissionDispatcherProxy
-    : public MediaPermissionDispatcher {
- public:
-  // |ui_task_runner| must be the UI thread. It will be used to call into the
-  // |media_permission| which is the MediaPermissionDispatcherImpl.
-  MediaPermissionDispatcherProxy(
-      scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
-      base::WeakPtr<MediaPermissionDispatcher> media_permission);
-
-  ~MediaPermissionDispatcherProxy() override;
-
-  // MediaPermission implementation.
-  void HasPermission(Type type,
-                     const GURL& security_origin,
-                     const PermissionStatusCB& permission_status_cb) override;
-
-  void RequestPermission(
-      Type type,
-      const GURL& security_origin,
-      const PermissionStatusCB& permission_status_cb) override;
-
- private:
-  class Core;
-
-  void ReportResult(bool result);
-
-  scoped_ptr<Core> core_;
-
-  base::WeakPtrFactory<MediaPermissionDispatcherProxy> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaPermissionDispatcherProxy);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_MEDIA_PERMISSION_PROXY_H_