PlzNavigate: Get StreamPrivate API to work.

chrome/browser/extensions/api/streams_private/streams_private_api.cc

Index: chrome/browser/extensions/api/streams_private/streams_private_api.cc
diff --git a/chrome/browser/extensions/api/streams_private/streams_private_api.cc b/chrome/browser/extensions/api/streams_private/streams_private_api.cc
index f17bef988217e9e38db5633d59e8b97a46a62c23..b7cedd930edfef6fec8eb8399f60be8bc1ffc531 100644
--- a/chrome/browser/extensions/api/streams_private/streams_private_api.cc
+++ b/chrome/browser/extensions/api/streams_private/streams_private_api.cc
@@ -89,8 +89,8 @@ void StreamsPrivateAPI::ExecuteMimeTypeHandler(
     std::unique_ptr<StreamContainer> stream_container(new StreamContainer(
         std::move(stream), tab_id, embedded, handler_url, extension_id));
     MimeHandlerStreamManager::Get(browser_context_)
-        ->AddStream(view_id, std::move(stream_container), render_process_id,
-                    render_frame_id);
+        ->AddStream(view_id, std::move(stream_container), web_contents,
+                    render_process_id, render_frame_id);
     return;
   }
   // Create the event's arguments value.