Fix ChunkDemuxer to handle a Shutdown() call before Initialize() is called.

media/filters/chunk_demuxer_unittest.cc

Index: media/filters/chunk_demuxer_unittest.cc
diff --git a/media/filters/chunk_demuxer_unittest.cc b/media/filters/chunk_demuxer_unittest.cc
index 32e068c56f791a745c8a8b1fab075bf4f99456b5..21de615b2d4fa0553a2229641cefd2f92106bde8 100644
--- a/media/filters/chunk_demuxer_unittest.cc
+++ b/media/filters/chunk_demuxer_unittest.cc
@@ -2515,4 +2515,14 @@ TEST_F(ChunkDemuxerTest, TestAppendAfterEndOfStream) {
   demuxer_->EndOfStream(PIPELINE_OK);
 }
 
+// Test receiving a Shutdown() call before we get an Initialize()
+// call. This can happen if video element gets destroyed before
+// the pipeline has a chance to initialize the demuxer.
+TEST_F(ChunkDemuxerTest, TestShutdownBeforeInitialize) {
+  demuxer_->Shutdown();
+  demuxer_->Initialize(
+      &host_, CreateInitDoneCB(DEMUXER_ERROR_COULD_NOT_OPEN));
+  message_loop_.RunUntilIdle();
+}
+
 }  // namespace media