Stop assuming metadata contains at least one stream

media/blink/webmediaplayer_impl_unittest.cc

Index: media/blink/webmediaplayer_impl_unittest.cc
diff --git a/media/blink/webmediaplayer_impl_unittest.cc b/media/blink/webmediaplayer_impl_unittest.cc
index 3f571530c390f334f6be207958498f05c51d6f8e..1a5347cf1db522afe821adb7e126232590d17cb4 100644
--- a/media/blink/webmediaplayer_impl_unittest.cc
+++ b/media/blink/webmediaplayer_impl_unittest.cc
@@ -733,6 +733,14 @@ TEST_F(WebMediaPlayerImplTest, AutoplayMuted_SetVolume) {
   wmpi_->SetVolume(1.0);
 }
 
+TEST_F(WebMediaPlayerImplTest, NoStreams) {
+  InitializeWebMediaPlayerImpl(true);
+  PipelineMetadata metadata;
+
+  // Nothing should happen.  In particular, no assertions should fail.
+  OnMetadata(metadata);
+}
+
 TEST_F(WebMediaPlayerImplTest, NaturalSizeChange) {
   InitializeWebMediaPlayerImpl(true);
   PipelineMetadata metadata;