Getting rid of AudioHardwareConfig and its synchronous IPC.

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index a70cb9c58cb5543f7c1bffb188827fd57ff15e1b..bffc34f0b89cad5f2ce91bd2e14bf049fe01ca47 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -872,11 +872,6 @@ IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_CreateFullscreenWidget,
 IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GenerateRoutingID,
                             int /* routing_id */)
 
-// Asks the browser for the default audio hardware configuration.
-IPC_SYNC_MESSAGE_CONTROL0_2(ViewHostMsg_GetAudioHardwareConfig,
-                            media::AudioParameters /* input parameters */,
-                            media::AudioParameters /* output parameters */)
-
 // These three messages are sent to the parent RenderViewHost to display the
 // page/widget that was created by
 // CreateWindow/CreateWidget/CreateFullscreenWidget. routing_id