Fixing naming issues in MediaSession

content/browser/media/session/media_session_delegate.h

-// Copyright 2016 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 CONTENT_BROWSER_MEDIA_SESSION_MEDIA_SESSION_DELEGATE_H_
-#define CONTENT_BROWSER_MEDIA_SESSION_MEDIA_SESSION_DELEGATE_H_
-
-#include "content/browser/media/session/audio_focus_manager.h"
-#include "content/browser/media/session/media_session.h"
-
-namespace content {
-
-// MediaSessionDelegate is an interface abstracting audio focus handling for the
-// MediaSession class.
-class MediaSessionDelegate {
- public:
-  // Factory method returning an implementation of MediaSessionDelegate.
-  static std::unique_ptr<MediaSessionDelegate> Create(
-      MediaSession* media_session);
-
-  virtual ~MediaSessionDelegate() = default;
-
-  virtual bool RequestAudioFocus(
-      AudioFocusManager::AudioFocusType audio_focus_type) = 0;
-  virtual void AbandonAudioFocus() = 0;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_MEDIA_SESSION_MEDIA_SESSION_DELEGATE_H_