Getting rid of AudioHardwareConfig and its synchronous IPC.

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 854 matching lines @@
 // Similar to ViewHostMsg_CreateWidget except the widget is a full screen
 // window.
 IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_CreateFullscreenWidget,
                             int /* opener_id */,
                             int /* route_id */)
 
 // Asks the browser for a unique routing ID.
 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
 // refers to the id that was returned from the Create message above.
 // The initial_rect parameter is in screen coordinates.
 //
 // FUTURE: there will probably be flags here to control if the result is
 // in a new window.
 IPC_MESSAGE_ROUTED4(ViewHostMsg_ShowView,
                     int /* route_id */,
@@ skipping 297 matching lines @@
                     int /* y */)
 
 #elif defined(OS_MACOSX)
 // Receives content of a web page as plain text.
 IPC_MESSAGE_ROUTED1(ViewMsg_GetRenderedTextCompleted, std::string)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.