Revert of Remove ignored return code from modules.

webrtc/api/test/fakeaudiocapturemodule.h

Index: webrtc/api/test/fakeaudiocapturemodule.h
diff --git a/webrtc/api/test/fakeaudiocapturemodule.h b/webrtc/api/test/fakeaudiocapturemodule.h
index 9200bdf6f318e414a895436274d60dddcae0a014..c27d02df6432a82361982773b251f9c1695aebf2 100644
--- a/webrtc/api/test/fakeaudiocapturemodule.h
+++ b/webrtc/api/test/fakeaudiocapturemodule.h
@@ -56,7 +56,7 @@
   // nothing and return success. If a function is not expected to be called by
   // PeerConnection an assertion is triggered if it is in fact called.
   int64_t TimeUntilNextProcess() override;
-  void Process() override;
+  int32_t Process() override;
 
   int32_t ActiveAudioLayer(AudioLayer* audio_layer) const override;