[ObjC ARC] Converts components/autofill/ios/browser:browser to ARC.

components/autofill/ios/browser/credit_card_util.mm

Index: components/autofill/ios/browser/credit_card_util.mm
diff --git a/components/autofill/ios/browser/credit_card_util.mm b/components/autofill/ios/browser/credit_card_util.mm
index e62b9e82cd8b82acc3615b658fceacd975165fc9..3eaaf6da2aed6c78bc1884610454b9d70a009e0e 100644
--- a/components/autofill/ios/browser/credit_card_util.mm
+++ b/components/autofill/ios/browser/credit_card_util.mm
@@ -8,6 +8,10 @@
 #include "components/autofill/core/browser/autofill_type.h"
 #include "components/autofill/core/browser/credit_card.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace autofill {
 
 NSString* GetCreditCardName(const CreditCard& credit_card,
@@ -21,8 +25,7 @@ NSString* GetCreditCardObfuscatedNumber(const CreditCard& credit_card) {
 }
 
 NSDateComponents* GetCreditCardExpirationDate(const CreditCard& credit_card) {
-  NSDateComponents* expiration_date =
-      [[[NSDateComponents alloc] init] autorelease];
+  NSDateComponents* expiration_date = [[NSDateComponents alloc] init];
   expiration_date.year = credit_card.expiration_year();
   expiration_date.month = credit_card.expiration_month();
   return expiration_date;