| Index: ios/chrome/browser/ui/tabs/tab_strip_view.mm | 
| diff --git a/ios/chrome/browser/ui/tabs/tab_strip_view.mm b/ios/chrome/browser/ui/tabs/tab_strip_view.mm | 
| index 2edabbbafb6f5cf8b6f5e5b05a3cb451db479cf0..9edbb7edd25cb8de8c074a25bf4594e5fa26e231 100644 | 
| --- a/ios/chrome/browser/ui/tabs/tab_strip_view.mm | 
| +++ b/ios/chrome/browser/ui/tabs/tab_strip_view.mm | 
| @@ -4,6 +4,10 @@ | 
|  | 
| #import "ios/chrome/browser/ui/tabs/tab_strip_view.h" | 
|  | 
| +#if !defined(__has_feature) || !__has_feature(objc_arc) | 
| +#error "This file requires ARC support." | 
| +#endif | 
| + | 
| @implementation TabStripView | 
|  | 
| @synthesize layoutDelegate = layoutDelegate_; | 
|  |