Getting rid of AudioHardwareConfig and its synchronous IPC.

content/browser/renderer_host/render_message_filter.cc

Index: content/browser/renderer_host/render_message_filter.cc
diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index 3843d8865b2e74b3845da50cc6a5146b35ed208a..befd3b3c71f3732265ed2c901bd20c6b514be387 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -212,8 +212,6 @@ bool RenderMessageFilter::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(
         RenderProcessHostMsg_DidGenerateCacheableMetadataInCacheStorage,
         OnCacheableMetadataAvailableForCacheStorage)
-    IPC_MESSAGE_HANDLER(ViewHostMsg_GetAudioHardwareConfig,
-                        OnGetAudioHardwareConfig)
 #if defined(OS_MACOSX)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(RenderProcessHostMsg_LoadFont, OnLoadFont)
 #elif defined(OS_WIN)
@@ -238,14 +236,6 @@ void RenderMessageFilter::OverrideThreadForMessage(const IPC::Message& message,
     *thread = BrowserThread::UI;
 }
 
-base::TaskRunner* RenderMessageFilter::OverrideTaskRunnerForMessage(
-    const IPC::Message& message) {
-  // Always query audio device parameters on the audio thread.
-  if (message.type() == ViewHostMsg_GetAudioHardwareConfig::ID)

[miu, 2016/07/14 21:17:03]

Yuk. We used to use VideoHostMsg for getting *audio* config?!? I'm super-glad
you're removing this now! :-)

-    return audio_manager_->GetTaskRunner();
-  return NULL;
-}
-
 void RenderMessageFilter::OnCreateWindow(
     const ViewHostMsg_CreateWindow_Params& params,
     ViewHostMsg_CreateWindow_Reply* reply) {
@@ -304,18 +294,6 @@ void RenderMessageFilter::OnGenerateRoutingID(int* route_id) {
   *route_id = render_widget_helper_->GetNextRoutingID();
 }
 
-void RenderMessageFilter::OnGetAudioHardwareConfig(
-    media::AudioParameters* input_params,
-    media::AudioParameters* output_params) {
-  DCHECK(input_params);
-  DCHECK(output_params);
-  *output_params = audio_manager_->GetDefaultOutputStreamParameters();
-
-  // TODO(henrika): add support for all available input devices.
-  *input_params = audio_manager_->GetInputStreamParameters(
-      media::AudioDeviceDescription::kDefaultDeviceId);
-}
-
 #if defined(OS_MACOSX)
 
 void RenderMessageFilter::OnLoadFont(const FontDescriptor& font,