Revert of Remove ignored return code from modules.

webrtc/modules/video_capture/video_capture_impl.h

 /*
  *  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 61 matching lines @@
       return apply_rotation_;
     }
 
     virtual void EnableFrameRateCallback(const bool enable);
     virtual void EnableNoPictureAlarm(const bool enable);
 
     virtual const char* CurrentDeviceName() const;
 
     // Module handling
     virtual int64_t TimeUntilNextProcess();
-    virtual void Process();
+    virtual int32_t Process();
 
     // Implement VideoCaptureExternal
     // |capture_time| must be specified in NTP time format in milliseconds.
     virtual int32_t IncomingFrame(uint8_t* videoFrame,
                                   size_t videoFrameLength,
                                   const VideoCaptureCapability& frameInfo,
                                   int64_t captureTime = 0);
 
     // Platform dependent
     virtual int32_t StartCapture(const VideoCaptureCapability& capability)
@@ skipping 40 matching lines @@
                                  // capture module.
 
     VideoFrame _captureFrame;
 
     // Indicate whether rotation should be applied before delivered externally.
     bool apply_rotation_;
 };
 }  // namespace videocapturemodule
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_VIDEO_CAPTURE_MAIN_SOURCE_VIDEO_CAPTURE_IMPL_H_