Fixing naming issues in MediaSession

content/browser/media/session/mock_media_session_observer.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.
-
-#include <stddef.h>
-#include <vector>
-
-#include "content/browser/media/session/media_session_observer.h"
-
-namespace content {
-
-// MockMediaSessionObserver is a mock implementation of MediaSessionObserver to
-// be used in tests.
-class MockMediaSessionObserver : public MediaSessionObserver {
- public:
-  MockMediaSessionObserver();
-  ~MockMediaSessionObserver() override;
-
-  // Implements MediaSessionObserver.
-  void OnSuspend(int player_id) override;
-  void OnResume(int player_id) override;
-  void OnSetVolumeMultiplier(int player_id, double volume_multiplier) override;
-
-  // Simulate that a new player started.
-  // Returns the player_id.
-  int StartNewPlayer();
-
-  // Returns whether |player_id| is playing.
-  bool IsPlaying(size_t player_id);
-
-  // Returns the volume multiplier of |player_id|.
-  double GetVolumeMultiplier(size_t player_id);
-
-  // Simulate a play state change for |player_id|.
-  void SetPlaying(size_t player_id, bool playing);
-
-  int received_suspend_calls() const;
-  int received_resume_calls() const;
-
- private:
-  // Internal representation of the players to keep track of their statuses.
-  struct MockPlayer {
-   public:
-    MockPlayer(bool is_playing = true, double volume_multiplier = 1.0f)
-        : is_playing_(is_playing),
-          volume_multiplier_(volume_multiplier) {}
-    bool is_playing_;
-    double volume_multiplier_;
-  };
-
-  // Basic representation of the players. The position in the vector is the
-  // player_id. The value of the vector is the playing status and volume.
-  std::vector<MockPlayer> players_;
-
-  int received_resume_calls_ = 0;
-  int received_suspend_calls_ = 0;
-};
-
-}  // namespace content