Getting rid of AudioHardwareConfig and its synchronous IPC.

content/renderer/render_thread_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_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 618 matching lines @@
   scoped_refptr<StreamTextureFactory> stream_texture_factory_;
 #endif
 
   scoped_refptr<ContextProviderCommandBuffer> shared_main_thread_contexts_;
 
   base::ObserverList<RenderThreadObserver> observers_;
 
   scoped_refptr<ContextProviderCommandBuffer> shared_worker_context_provider_;
 
   std::unique_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
-  std::unique_ptr<media::AudioHardwareConfig> audio_hardware_config_;
 
   HistogramCustomizer histogram_customizer_;
 
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 
   std::unique_ptr<MemoryObserver> memory_observer_;
 
   scoped_refptr<base::SingleThreadTaskRunner>
       main_thread_compositor_task_runner_;
 
@@ skipping 49 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_