| Index: ios/chrome/browser/BUILD.gn | 
| diff --git a/ios/chrome/browser/BUILD.gn b/ios/chrome/browser/BUILD.gn | 
| index 7dd7514741ecc7eab9e8df5d53862a6f2979fe39..7b5802323f28b6e33d458469274b15fbc0ada3f5 100644 | 
| --- a/ios/chrome/browser/BUILD.gn | 
| +++ b/ios/chrome/browser/BUILD.gn | 
| @@ -360,6 +360,8 @@ source_set("browser") { | 
| "reading_list/reading_list_model_storage.h", | 
| "reading_list/reading_list_model_storage_defaults.h", | 
| "reading_list/reading_list_model_storage_defaults.mm", | 
| +    "reading_list/reading_list_web_state_observer.h", | 
| +    "reading_list/reading_list_web_state_observer.mm", | 
| "reading_list/url_downloader.cc", | 
| "reading_list/url_downloader.h", | 
| "root_coordinator.h", | 
|  |