Revert "[scheduler] Teach scheduler about audio state"

content/browser/web_contents/web_contents_impl.h

 // Copyright (c) 2012 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_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <stdint.h>
 
 #include <functional>
@@ skipping 309 matching lines @@
   int GetCapturerCount() const override;
   bool IsAudioMuted() const override;
   void SetAudioMuted(bool mute) override;
   bool IsConnectedToBluetoothDevice() const override;
   bool IsCrashed() const override;
   void SetIsCrashed(base::TerminationStatus status, int error_code) override;
   base::TerminationStatus GetCrashedStatus() const override;
   int GetCrashedErrorCode() const override;
   bool IsBeingDestroyed() const override;
   void NotifyNavigationStateChanged(InvalidateTypes changed_flags) override;
-  void OnAudioStateChanged(bool is_audio_playing) override;
   base::TimeTicks GetLastActiveTime() const override;
   void SetLastActiveTime(base::TimeTicks last_active_time) override;
   void WasShown() override;
   void WasHidden() override;
   bool NeedToFireBeforeUnload() override;
   void DispatchBeforeUnload() override;
   void AttachToOuterWebContentsFrame(
       WebContents* outer_web_contents,
       RenderFrameHost* outer_contents_frame) override;
   void Stop() override;
@@ skipping 1161 matching lines @@
   // Adds/removes a callback called on creation of each new WebContents.
   static void AddCreatedCallbackForTesting(const CreatedCallback& callback);
   static void RemoveCreatedCallbackForTesting(const CreatedCallback& callback);
 
   DISALLOW_COPY_AND_ASSIGN(FriendZone);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_