Revert of Remove ignored return code from modules.

webrtc/modules/video_capture/video_capture_impl.cc

Index: webrtc/modules/video_capture/video_capture_impl.cc
diff --git a/webrtc/modules/video_capture/video_capture_impl.cc b/webrtc/modules/video_capture/video_capture_impl.cc
index 3013a7def06042c3c9e5e3f6e46b92a385b1d29b..90730cd98429e75dd97db3f116273254e2b18073 100644
--- a/webrtc/modules/video_capture/video_capture_impl.cc
+++ b/webrtc/modules/video_capture/video_capture_impl.cc
@@ -93,7 +93,7 @@
 }
 
 // Process any pending tasks such as timeouts
-void VideoCaptureImpl::Process()
+int32_t VideoCaptureImpl::Process()
 {
     CriticalSectionScoped cs(&_callBackCs);
 
@@ -136,6 +136,8 @@
     }
 
     _lastProcessFrameCount = _incomingFrameTimes[0];
+
+    return 0;
 }
 
 VideoCaptureImpl::VideoCaptureImpl(const int32_t id)