Reverted the code for the non-interactive audible tab notification

content/browser/android/media_players_observer.h

Index: content/browser/android/media_players_observer.h
diff --git a/content/browser/android/media_players_observer.h b/content/browser/android/media_players_observer.h
deleted file mode 100644
index b01a3bf916a02555186884fdc6ffccae68edef27..0000000000000000000000000000000000000000
--- a/content/browser/android/media_players_observer.h
+++ /dev/null
@@ -1,51 +0,0 @@
-// 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 CONTENT_BROWSER_ANDROID_MEDIA_PLAYERS_OBSERVER_H_
-#define CONTENT_BROWSER_ANDROID_MEDIA_PLAYERS_OBSERVER_H_
-
-#include <map>
-
-#include "base/macros.h"
-#include "content/browser/media/audio_state_provider.h"
-
-namespace content {
-
-class RenderFrameHost;
-
-// On Android the MediaPlayerAndroid objects report
-// the audible state to us.
-class MediaPlayersObserver : public AudioStateProvider {
- public:
-  explicit MediaPlayersObserver(WebContents* web_contents);
-  ~MediaPlayersObserver() override;
-
-  bool IsAudioStateAvailable() const override;
-
-  // This audio state provider does not have a monitor,
-  // the method returns nullptr.
-  AudioStreamMonitor* audio_stream_monitor() override;
-
-  // These methods constitute the observer pattern, should
-  // be called when corresponding event happens. They will notify
-  // WebContents whenever its audible state as a whole changes.
-  void OnAudibleStateChanged(RenderFrameHost* rfh, int player_id,
-                             bool is_audible);
-  void RemovePlayer(RenderFrameHost* rfh, int player_id);
-  void RenderFrameDeleted(RenderFrameHost* rfh);
-
- private:
-  void UpdateStatusAndNotify();
-
-  // Audible status per player ID and frame
-  typedef std::pair<RenderFrameHost*, int> Key;
-  typedef std::map<Key, bool> StatusMap;
-  StatusMap audio_status_map_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaPlayersObserver);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_ANDROID_MEDIA_PLAYERS_OBSERVER_H_