Strip out stream counting from AudioRendererHost.

content/browser/renderer_host/media/audio_renderer_host.h

Index: content/browser/renderer_host/media/audio_renderer_host.h
diff --git a/content/browser/renderer_host/media/audio_renderer_host.h b/content/browser/renderer_host/media/audio_renderer_host.h
index 6170e9354081e6aa63b2099a899d695ec14c1247..0d0ca36b3ea711a4bf5f7b3aaca89bb47b10abf0 100644
--- a/content/browser/renderer_host/media/audio_renderer_host.h
+++ b/content/browser/renderer_host/media/audio_renderer_host.h
@@ -93,11 +93,6 @@ class CONTENT_EXPORT AudioRendererHost
                        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);
 
@@ -216,10 +211,6 @@ class CONTENT_EXPORT AudioRendererHost
   // 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_;
 
@@ -234,10 +225,6 @@ class CONTENT_EXPORT AudioRendererHost
   // 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);