Relax cross-origin partial response requirements for CORS presence.

media/blink/buffered_data_source.cc

Index: media/blink/buffered_data_source.cc
diff --git a/media/blink/buffered_data_source.cc b/media/blink/buffered_data_source.cc
index eb4c984995ace670230b3ab660fdc6881ab0789d..0fc16175ff4ec782c1766ab206ec2b52416b62a2 100644
--- a/media/blink/buffered_data_source.cc
+++ b/media/blink/buffered_data_source.cc
@@ -431,9 +431,10 @@ bool BufferedDataSource::CheckPartialResponseURL(
   // generated bytes and the target response. See http://crbug.com/489060#c32
   // for details.
   // If the origin of the new response is different from the first response we
-  // deny the redirected response.
-  return response_original_url_.GetOrigin() ==
-         partial_response_original_url.GetOrigin();
+  // deny the redirected response unless the crossorigin attribute has been set.
+  return (response_original_url_.GetOrigin() ==
+          partial_response_original_url.GetOrigin()) ||
+         DidPassCORSAccessCheck();
 }
 
 void BufferedDataSource::ReadCallback(