| Index: ios/chrome/browser/ui/tabs/target_frame_cache.mm | 
| diff --git a/ios/chrome/browser/ui/tabs/target_frame_cache.mm b/ios/chrome/browser/ui/tabs/target_frame_cache.mm | 
| index 12f6308cf5aa38505787197e57cdd16d7ff247c4..72b1917b1f5d4f385888ccb968d6768f98b39831 100644 | 
| --- a/ios/chrome/browser/ui/tabs/target_frame_cache.mm | 
| +++ b/ios/chrome/browser/ui/tabs/target_frame_cache.mm | 
| @@ -4,6 +4,10 @@ | 
|  | 
| #include "ios/chrome/browser/ui/tabs/target_frame_cache.h" | 
|  | 
| +#if !defined(__has_feature) || !__has_feature(objc_arc) | 
| +#error "This file requires ARC support." | 
| +#endif | 
| + | 
| TargetFrameCache::TargetFrameCache() {} | 
|  | 
| TargetFrameCache::~TargetFrameCache() {} | 
|  |