Chromium Code Reviews| Index: ios/testing/wait_util.mm | 
| diff --git a/ios/testing/wait_util.mm b/ios/testing/wait_util.mm | 
| index d39636bd1ee6a32b770989ed5a2b333a713c3ba2..222974a44e15e37982a76d1e5edc90d819895326 100644 | 
| --- a/ios/testing/wait_util.mm | 
| +++ b/ios/testing/wait_util.mm | 
| @@ -6,6 +6,10 @@ | 
| #include "base/test/ios/wait_util.h" | 
| +#if !defined(__has_feature) || !__has_feature(objc_arc) | 
| +#error "This file requires ARC support." | 
| +#endif | 
| + | 
| namespace testing { | 
| const NSTimeInterval kSpinDelaySeconds = 0.01; |