Caching AudioOutputDevice instances in mixer manager

media/renderers/default_renderer_factory.h

Index: media/renderers/default_renderer_factory.h
diff --git a/media/renderers/default_renderer_factory.h b/media/renderers/default_renderer_factory.h
index 3163d531de26df1565927e2bb5a88e8670344cec..5c1528f7bbdcf477499840904b38da6cd39da7c0 100644
--- a/media/renderers/default_renderer_factory.h
+++ b/media/renderers/default_renderer_factory.h
@@ -31,8 +31,7 @@ class MEDIA_EXPORT DefaultRendererFactory : public RendererFactory {
 
   DefaultRendererFactory(const scoped_refptr<MediaLog>& media_log,
                          DecoderFactory* decoder_factory,
-                         const GetGpuFactoriesCB& get_gpu_factories_cb,
-                         const AudioHardwareConfig& audio_hardware_config);
+                         const GetGpuFactoriesCB& get_gpu_factories_cb);
   ~DefaultRendererFactory() final;
 
   std::unique_ptr<Renderer> CreateRenderer(
@@ -59,8 +58,6 @@ class MEDIA_EXPORT DefaultRendererFactory : public RendererFactory {
   // Creates factories for supporting video accelerators. May be null.
   GetGpuFactoriesCB get_gpu_factories_cb_;
 
-  const AudioHardwareConfig& audio_hardware_config_;
-
   DISALLOW_COPY_AND_ASSIGN(DefaultRendererFactory);
 };