Index: ios/chrome/browser/web/dom_altering_lock.mm |
diff --git a/ios/chrome/browser/web/dom_altering_lock.mm b/ios/chrome/browser/web/dom_altering_lock.mm |
index 3733d6af43ec1ad9ad6ee4f712a078880ec4271f..d999ad8740e4bc41f657c199537bde04685ef037 100644 |
--- a/ios/chrome/browser/web/dom_altering_lock.mm |
+++ b/ios/chrome/browser/web/dom_altering_lock.mm |
@@ -7,6 +7,10 @@ |
#include "base/logging.h" |
#include "ios/web/public/web_thread.h" |
+#if !defined(__has_feature) || !__has_feature(objc_arc) |
+#error "This file requires ARC support." |
+#endif |
+ |
DEFINE_WEB_STATE_USER_DATA_KEY(DOMAlteringLock); |
DOMAlteringLock::DOMAlteringLock(web::WebState* web_state) { |