PlzNavigate: send searchable form data to the browser side on form submission.

content/public/common/frame_navigate_params.h

Index: content/public/common/frame_navigate_params.h
diff --git a/content/public/common/frame_navigate_params.h b/content/public/common/frame_navigate_params.h
index 620fc13342229d0cd3486ff8ae1cb23ec35be06c..32efd4fc1163cf54dca79b6f7434378c92833642 100644
--- a/content/public/common/frame_navigate_params.h
+++ b/content/public/common/frame_navigate_params.h
@@ -75,10 +75,6 @@ struct CONTENT_EXPORT FrameNavigateParams : public IPC::NoParams {
   // the browser history.  E.g., on unreachable urls.
   bool should_update_history;
 
-  // See SearchableFormData for a description of these.
-  GURL searchable_form_url;
-  std::string searchable_form_encoding;
-
   // Contents MIME type of main frame.
   std::string contents_mime_type;