Getting rid of AudioHardwareConfig and its synchronous IPC.

content/renderer/media/audio_renderer_sink_cache_impl.cc

 // Copyright 2016 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.
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/synchronization/lock.h"
@@ skipping 104 matching lines @@
 }
 
 scoped_refptr<media::AudioRendererSink> AudioRendererSinkCacheImpl::GetSink(
     int source_render_frame_id,
     const std::string& device_id,
     const url::Origin& security_origin) {
   base::AutoLock auto_lock(cache_lock_);
 
   auto cache_iter =
       FindCacheEntry_Locked(source_render_frame_id, device_id, security_origin,
-                            true /* unused_only */);
+                            true /* unused sink only */);
 
   if (cache_iter != cache_.end()) {
     // Found unused sink; mark it as used and return.
     DVLOG(1) << "GetSink: address: " << cache_iter->sink.get()
              << " - found unused cached sink, reusing it.";
 
     cache_iter->used = true;
     return cache_iter->sink;
   }
 
@@ skipping 108 matching lines @@
         return val.device_id == device_id &&
                val.security_origin == security_origin;
       });
 };
 
 int AudioRendererSinkCacheImpl::GetCacheSizeForTesting() {
   return cache_.size();
 }
 
 }  // namespace content