Change DCHECK in VCMDecodedFrameCallback back to just logging.

webrtc/modules/video_coding/generic_decoder.cc

Index: webrtc/modules/video_coding/generic_decoder.cc
diff --git a/webrtc/modules/video_coding/generic_decoder.cc b/webrtc/modules/video_coding/generic_decoder.cc
index 48bf237996a9e6501405f3bad8cd30b716718493..2efdd1bc264008ba6a846bf2dc9f5e9153fe3e57 100644
--- a/webrtc/modules/video_coding/generic_decoder.cc
+++ b/webrtc/modules/video_coding/generic_decoder.cc
@@ -59,7 +59,6 @@ int32_t VCMDecodedFrameCallback::Decoded(VideoFrame& decodedImage,
     frameInfo = _timestampMap.Pop(decodedImage.timestamp());
     callback = _receiveCallback;
   }
-  RTC_DCHECK(callback != nullptr);
 
   if (frameInfo == NULL) {
     LOG(LS_WARNING) << "Too many frames backed up in the decoder, dropping "
@@ -77,7 +76,10 @@ int32_t VCMDecodedFrameCallback::Decoded(VideoFrame& decodedImage,
 
   decodedImage.set_render_time_ms(frameInfo->renderTimeMs);
   decodedImage.set_rotation(frameInfo->rotation);
-  callback->FrameToRender(decodedImage);
+  if (callback)

[stefan-webrtc, 2016/10/03 09:30:32]

{}

+    callback->FrameToRender(decodedImage);
+  else

[stefan-webrtc, 2016/10/03 09:30:32]

} else {

+    LOG(LS_WARNING) << "No callback, dropping frame.";
   return WEBRTC_VIDEO_CODEC_OK;
 }