Revert of Propagate audible state from player to the containing tab

content/browser/android/media_players_observer.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 "content/browser/android/media_players_observer.h"
-
-#include <climits>
-
-#include "base/logging.h"
-#include "content/public/browser/web_contents.h"
-
-namespace content {
-
-MediaPlayersObserver::MediaPlayersObserver(WebContents* web_contents)
-    : AudioStateProvider(web_contents) {
-}
-
-MediaPlayersObserver::~MediaPlayersObserver() {}
-
-bool MediaPlayersObserver::IsAudioStateAvailable() const {
-  return true;
-}
-
-// This audio state provider does not have a monitor
-AudioStreamMonitor* MediaPlayersObserver::audio_stream_monitor() {
-  return nullptr;
-}
-
-void MediaPlayersObserver::OnAudibleStateChanged(RenderFrameHost* rfh,
-                                                int player_id,
-                                                bool is_audible) {
-  audio_status_map_[Key(rfh, player_id)] = is_audible;
-  UpdateStatusAndNotify();
-}
-
-void MediaPlayersObserver::RemovePlayer(RenderFrameHost* rfh, int player_id) {
-  size_t num_erased_entries = audio_status_map_.erase(Key(rfh, player_id));
-  DCHECK_EQ(1u, num_erased_entries);
-  UpdateStatusAndNotify();
-}
-
-void MediaPlayersObserver::RenderFrameDeleted(RenderFrameHost* rfh) {
-  StatusMap::iterator begin = audio_status_map_.lower_bound(Key(rfh, 0));
-  StatusMap::iterator end = audio_status_map_.upper_bound(Key(rfh, INT_MAX));
-  audio_status_map_.erase(begin, end);
-  UpdateStatusAndNotify();
-}
-
-void MediaPlayersObserver::UpdateStatusAndNotify() {
-  for (const auto& player_status : audio_status_map_) {
-    if (player_status.second) {
-      Notify(true);  // at least one player is making noise
-      return;
-    }
-  }
-
-  Notify(false);
-}
-
-} // namespace content