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 7eb522b67b73106d8f09fb1da642307d4fa1fcfd..4729e2373280bd53e464e91ede177e2a32e8c6ef 100644
--- a/media/base/pipeline_impl.cc
+++ b/media/base/pipeline_impl.cc
@@ -578,7 +578,7 @@ 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()
@@ -597,7 +597,7 @@ 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()