Report PIPELINE_ERROR_DECODE when SourceState::Append fails.

media/filters/chunk_demuxer.cc

Index: media/filters/chunk_demuxer.cc
diff --git a/media/filters/chunk_demuxer.cc b/media/filters/chunk_demuxer.cc
index 55ff88c2dac11361fa76d67e999024465d14cdae..32e7b15d6ba67e2e27ca583c64eaeca0083d554a 100644
--- a/media/filters/chunk_demuxer.cc
+++ b/media/filters/chunk_demuxer.cc
@@ -1303,17 +1303,6 @@ void ChunkDemuxer::AppendData(
 
     switch (state_) {
       case INITIALIZING:
-        DCHECK(IsValidId(id));
-        if (!source_state_map_[id]->Append(data, length,
-                                           append_window_start,
-                                           append_window_end,
-                                           timestamp_offset,
-                                           init_segment_received_cb)) {
-          ReportError_Locked(DEMUXER_ERROR_COULD_NOT_OPEN);
-          return;
-        }
-        break;
-
       case INITIALIZED: {
         DCHECK(IsValidId(id));
         if (!source_state_map_[id]->Append(data, length,