| Index: ios/chrome/browser/ui/toolbar/BUILD.gn | 
| diff --git a/ios/chrome/browser/ui/toolbar/BUILD.gn b/ios/chrome/browser/ui/toolbar/BUILD.gn | 
| index 65fe92404af2603317a521d5693313c70d6a9f7a..423dec26f2869ccd3ac148d6fbbbae25de9d81ae 100644 | 
| --- a/ios/chrome/browser/ui/toolbar/BUILD.gn | 
| +++ b/ios/chrome/browser/ui/toolbar/BUILD.gn | 
| @@ -151,6 +151,7 @@ source_set("test_support") { | 
| } | 
|  | 
| source_set("unit_tests") { | 
| +  configs += [ "//build/config/compiler:enable_arc" ] | 
| testonly = true | 
| sources = [ | 
| "toolbar_controller_unittest.mm", | 
|  |