Revert of Remove ignored return code from modules.

webrtc/modules/audio_device/audio_device_impl.cc

Index: webrtc/modules/audio_device/audio_device_impl.cc
diff --git a/webrtc/modules/audio_device/audio_device_impl.cc b/webrtc/modules/audio_device/audio_device_impl.cc
index 6496f5efc43d800ee0f4da37e2c909a05000e9ab..a11c496289246ec25a90e722c5590a8d7fd1d576 100644
--- a/webrtc/modules/audio_device/audio_device_impl.cc
+++ b/webrtc/modules/audio_device/audio_device_impl.cc
@@ -427,7 +427,7 @@
 //  new reports exists.
 // ----------------------------------------------------------------------------
 
-void AudioDeviceModuleImpl::Process()
+int32_t AudioDeviceModuleImpl::Process()
 {
 
     _lastProcessTime = TickTime::MillisecondTimestamp();
@@ -479,6 +479,8 @@
         }
         _ptrAudioDevice->ClearRecordingError();
     }
+
+    return 0;
 }
 
 // ============================================================================