Revert of Revert of Remove the last piece of deprecated synchronous IO code.

content/renderer/pepper/pepper_platform_audio_input.cc

 // 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.
 
 #include "content/renderer/pepper/pepper_platform_audio_input.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "build/build_config.h"
@@ skipping 154 matching lines @@
   if (!GetMediaDeviceManager())
     return false;
 
   ipc_ = RenderThreadImpl::current()
              ->audio_input_message_filter()
              ->CreateAudioInputIPC(render_frame->render_view()->GetRoutingID());
 
   params_.Reset(media::AudioParameters::AUDIO_PCM_LINEAR,
                 media::CHANNEL_LAYOUT_MONO,
                 ppapi::kAudioInputChannels,
-                0,
                 sample_rate,
                 ppapi::kBitsPerAudioInputSample,
                 frames_per_buffer);
 
   // We need to open the device and obtain the label and session ID before
   // initializing.
   pending_open_device_id_ = GetMediaDeviceManager()->OpenDevice(
       PP_DEVICETYPE_DEV_AUDIOCAPTURE,
       device_id.empty() ? media::AudioManagerBase::kDefaultDeviceId : device_id,
       document_url,
@@ skipping 101 matching lines @@
 PepperMediaDeviceManager* PepperPlatformAudioInput::GetMediaDeviceManager() {
   DCHECK(main_message_loop_proxy_->BelongsToCurrentThread());
 
   RenderFrameImpl* const render_frame =
       RenderFrameImpl::FromRoutingID(render_frame_id_);
   return render_frame ?
       PepperMediaDeviceManager::GetForRenderFrame(render_frame) : NULL;
 }
 
 }  // namespace content