Strip out stream counting from AudioRendererHost.

content/browser/renderer_host/media/audio_renderer_host.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.
 //
 // AudioRendererHost serves audio related requests from AudioRenderer which
 // lives inside the render process and provide access to audio hardware.
 //
 // This class is owned by RenderProcessHostImpl, and instantiated on UI
 // thread, but all other operations and method calls happen on IO thread, so we
 // need to be extra careful about the lifetime of this object. AudioManager is a
@@ skipping 75 matching lines @@
   // BrowserMessageFilter implementation.
   void OnChannelClosing() override;
   void OnDestruct() const override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // AudioOutputDelegate::EventHandler implementation
   void OnStreamCreated(int stream_id,
                        base::SharedMemory* shared_memory,
                        base::CancelableSyncSocket* foreign_socket) override;
   void OnStreamError(int stream_id) override;
-  void OnStreamStateChanged(bool is_playing) override;
-
-  // Returns true if any streams managed by this host are actively playing.  Can
-  // be called from any thread.
-  bool HasActiveAudio();
 
   void OverrideDevicePermissionsForTesting(bool has_access);
 
  private:
   friend class AudioRendererHostTest;
   friend class BrowserThread;
   friend class base::DeleteHelper<AudioRendererHost>;
   friend class MockAudioRendererHost;
   friend class TestAudioRendererHost;
   FRIEND_TEST_ALL_PREFIXES(AudioRendererHostTest, CreateMockStream);
@@ skipping 97 matching lines @@
 
   media::AudioManager* const audio_manager_;
   AudioMirroringManager* const mirroring_manager_;
 
   // Used to access to AudioInputDeviceManager.
   MediaStreamManager* media_stream_manager_;
 
   // A list of the current open streams.
   AudioOutputDelegateVector delegates_;
 
-  // The number of streams in the playing state. Atomic read safe from any
-  // thread, but should only be updated from the IO thread.
-  base::AtomicRefCount num_playing_streams_;
-
   // Salt required to translate renderer device IDs to raw device unique IDs
   std::string salt_;
 
   // Map of device authorizations for streams that are not yet created
   // The key is the stream ID, and the value is a pair. The pair's first element
   // is a bool that is true if the authorization process completes successfully.
   // The second element contains the unique ID of the authorized device.
   std::map<int, std::pair<bool, std::string>> authorizations_;
 
   // At stream creation time, AudioRendererHost will call this function on the
   // UI thread to validate render frame IDs. A default is set by the
   // constructor, but this can be overridden by unit tests.
   ValidateRenderFrameIdFunction validate_render_frame_id_function_;
 
-  // The maximum number of simultaneous streams during the lifetime of this
-  // host. Reported as UMA stat at shutdown.
-  size_t max_simultaneous_streams_;
-
   AudioOutputAuthorizationHandler authorization_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_RENDERER_HOST_H_