Reverted the code for the non-interactive audible tab notification

media/base/android/media_codec_player_unittest.cc

 // 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.
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/timer/timer.h"
 #include "media/base/android/demuxer_android.h"
 #include "media/base/android/media_codec_bridge.h"
 #include "media/base/android/media_codec_player.h"
@@ skipping 81 matching lines @@
   }
 
   void OnMediaInterrupted(int player_id) override {}
   void OnBufferingUpdate(int player_id, int percentage) override {}
   void OnSeekComplete(int player_id,
                       const base::TimeDelta& current_time) override {
     ++num_seeks_completed_;
   }
   void OnError(int player_id, int error) override {}
   void OnVideoSizeChanged(int player_id, int width, int height) override {}
-  void OnAudibleStateChanged(int player_id, bool is_audible_now) override {}
   void OnWaitingForDecryptionKey(int player_id) override {}
   MediaPlayerAndroid* GetFullscreenPlayer() override { return nullptr; }
   MediaPlayerAndroid* GetPlayer(int player_id) override { return nullptr; }
   bool RequestPlay(int player_id) override { return true; }
 
   void OnMediaResourcesRequested(int player_id) {}
 
   // Time update callback that reports the internal progress of the stream.
   // Implementation dependent, used for testing only.
   void OnDecodersTimeUpdate(DemuxerStream::Type stream_type,
@@ skipping 1469 matching lines @@
   // Play till completion.
   EXPECT_TRUE(
       WaitForCondition(base::Bind(&MockMediaPlayerManager::IsPlaybackCompleted,
                                   base::Unretained(&manager_))));
 
   // There should not be any video frames.
   EXPECT_FALSE(manager_.HasFirstFrame(DemuxerStream::VIDEO));
 }
 
 }  // namespace media