Disable download for overlay panel content

content/public/common/web_preferences.h

Index: content/public/common/web_preferences.h
diff --git a/content/public/common/web_preferences.h b/content/public/common/web_preferences.h
index bdceefc5266cd03235e49adbb76e32092c096a7d..9759112e1eabdcdf6123500823acd08a50ec2d9b 100644
--- a/content/public/common/web_preferences.h
+++ b/content/public/common/web_preferences.h
@@ -251,6 +251,9 @@ struct CONTENT_EXPORT WebPreferences {
   float default_minimum_page_scale_factor;
   float default_maximum_page_scale_factor;
 
+  // Whether download UI should be hidden on this page.
+  bool hide_download_ui;
+
   // We try to keep the default values the same as the default values in
   // chrome, except for the cases where it would require lots of extra work for
   // the embedder to use the same default value.