Check the response URL origin in BufferedDataSource to avoid mixing cross-origin responses.

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 d5f32b1ca298d4c787731c70eb26ead26632bea0..b3cb0ef93f56e5ab093340b6f5c007863a2e1a79 100644
--- a/media/blink/buffered_data_source.cc
+++ b/media/blink/buffered_data_source.cc
@@ -356,6 +356,7 @@ void BufferedDataSource::StartCallback(
     loader_->Stop();
     return;
   }
+  response_original_url_ = loader_->response_original_url();
 
   // All responses must be successful. Resources that are assumed to be fully
   // buffered must have a known content length.
@@ -403,8 +404,8 @@ void BufferedDataSource::PartialReadStartCallback(
     BufferedResourceLoader::Status status) {
   DCHECK(render_task_runner_->BelongsToCurrentThread());
   DCHECK(loader_.get());
-
-  if (status == BufferedResourceLoader::kOk) {
+  if (status == BufferedResourceLoader::kOk &&
+      response_original_url_ == loader_->response_original_url()) {
     // Once the request has started successfully, we can proceed with
     // reading from it.
     ReadInternal();