Revert of Propagate audible state from player to the containing tab

content/browser/media/audio_state_provider.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/media/audio_state_provider.h"
-
-#include "base/logging.h"
-#include "content/browser/media/audio_stream_monitor.h"
-#include "content/public/browser/web_contents.h"
-
-namespace content {
-
-AudioStateProvider::AudioStateProvider(WebContents* contents)
-    : web_contents_(contents),
-      was_recently_audible_(false) {
-  DCHECK(web_contents_);
-}
-
-bool AudioStateProvider::WasRecentlyAudible() const {
-  return was_recently_audible_;
-}
-
-void AudioStateProvider::Notify(bool new_state) {
-  if (was_recently_audible_ != new_state) {
-    was_recently_audible_ = new_state;
-    web_contents_->NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
-  }
-}
-
-} // namespace content