When viewing a PDF, clicking the "download" button has no effect. It should trigger a download (including the `"will-download"` event and associated machinery).
shell/browser/extensions/electron_extensions_api_client.cc
#include "shell/browser/extensions/electron_extensions_api_client.h"
#include <memory>
#include <string>
#include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest_delegate.h"
#include "shell/browser/extensions/electron_extension_web_contents_observer.h"
#include "shell/browser/extensions/electron_messaging_delegate.h"
namespace extensions {
class ElectronMimeHandlerViewGuestDelegate
    : public MimeHandlerViewGuestDelegate {
 public:
  ElectronMimeHandlerViewGuestDelegate() {}
  ~ElectronMimeHandlerViewGuestDelegate() override {}
  
  bool HandleContextMenu(content::WebContents* web_contents,