PlzNavigate: Get StreamPrivate API to work.

extensions/browser/guest_view/mime_handler_view/mime_handler_stream_manager.h

Index: extensions/browser/guest_view/mime_handler_view/mime_handler_stream_manager.h
diff --git a/extensions/browser/guest_view/mime_handler_view/mime_handler_stream_manager.h b/extensions/browser/guest_view/mime_handler_view/mime_handler_stream_manager.h
index 880f140b88c952beed6bb2f05ebe5751aea77d8f..83b5fd10cb58e600f55d51221bf38bfb887d9d59 100644
--- a/extensions/browser/guest_view/mime_handler_view/mime_handler_stream_manager.h
+++ b/extensions/browser/guest_view/mime_handler_view/mime_handler_stream_manager.h
@@ -16,6 +16,7 @@
 
 namespace content {
 class BrowserContext;
+class WebContents;
 }
 
 namespace extensions {
@@ -36,6 +37,7 @@ class MimeHandlerStreamManager : public KeyedService,
 
   void AddStream(const std::string& view_id,
                  std::unique_ptr<StreamContainer> stream,
+                 content::WebContents* web_contents,

[jam, 2016/09/14 22:49:52]

why are we passing both WC & RF IDs? it seems we should only have one, since
otherwise there could be bugs where they don't match.

[ananta, 2016/09/15 01:49:17]

Done. As per our discussion, I changed the EmbedderObserver  to cleanup the
stream on the top level frame navigation.

                  int render_process_id,
                  int render_frame_id);