Fix DCHECK when track status changes in non-playing state

media/base/pipeline_impl.cc

Index: media/base/pipeline_impl.cc
diff --git a/media/base/pipeline_impl.cc b/media/base/pipeline_impl.cc
index 43fdf5eb951113bab49777c1f94e89b3dc55434e..e11de9ddf375ab3765267e5680376b4b44aca7ad 100644
--- a/media/base/pipeline_impl.cc
+++ b/media/base/pipeline_impl.cc
@@ -583,7 +583,7 @@ void PipelineImpl::RendererWrapper::OnEnabledAudioTracksChanged(
   }
 
   DCHECK(demuxer_);
-  DCHECK(shared_state_.renderer);
+  DCHECK(shared_state_.renderer || (state_ != kPlaying));
 
   base::TimeDelta currTime = (state_ == kPlaying)
                                  ? shared_state_.renderer->GetMediaTime()
@@ -602,7 +602,7 @@ void PipelineImpl::RendererWrapper::OnSelectedVideoTrackChanged(
   }
 
   DCHECK(demuxer_);
-  DCHECK(shared_state_.renderer);
+  DCHECK(shared_state_.renderer || (state_ != kPlaying));
 
   base::TimeDelta currTime = (state_ == kPlaying)
                                  ? shared_state_.renderer->GetMediaTime()