Revert of Remove ignored return code from modules.

webrtc/modules/audio_device/audio_device_impl.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 409 matching lines @@
     return deltaProcess;
 }
 
 // ----------------------------------------------------------------------------
 //  Module::Process
 //
 //  Check for posted error and warning reports. Generate callbacks if
 //  new reports exists.
 // ----------------------------------------------------------------------------
 
-void AudioDeviceModuleImpl::Process()
+int32_t AudioDeviceModuleImpl::Process()
 {
 
     _lastProcessTime = TickTime::MillisecondTimestamp();
 
     // kPlayoutWarning
     if (_ptrAudioDevice->PlayoutWarning())
     {
         CriticalSectionScoped lock(&_critSectEventCb);
         if (_ptrCbAudioDeviceObserver)
         {
@@ skipping 31 matching lines @@
     if (_ptrAudioDevice->RecordingError())
     {
         CriticalSectionScoped lock(&_critSectEventCb);
         if (_ptrCbAudioDeviceObserver)
         {
             WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id, "=> OnErrorIsReported(kRecordingError)");
             _ptrCbAudioDeviceObserver->OnErrorIsReported(AudioDeviceObserver::kRecordingError);
         }
         _ptrAudioDevice->ClearRecordingError();
     }
+
+    return 0;
 }
 
 // ============================================================================
 //                                    Public API
 // ============================================================================
 
 // ----------------------------------------------------------------------------
 //  ActiveAudioLayer
 // ----------------------------------------------------------------------------
 
@@ skipping 1444 matching lines @@
 // ----------------------------------------------------------------------------
 //  PlatformAudioLayer
 // ----------------------------------------------------------------------------
 
 AudioDeviceModule::AudioLayer AudioDeviceModuleImpl::PlatformAudioLayer() const
 {
     return _platformAudioLayer;
 }
 
 }  // namespace webrtc